Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
natasha.aries
Group Title
Can someone PLEASE help me with 14d. and 15a. I have my precal final, and I still have no idea how to do some ?s!
 one year ago
 one year ago
natasha.aries Group Title
Can someone PLEASE help me with 14d. and 15a. I have my precal final, and I still have no idea how to do some ?s!
 one year ago
 one year ago

This Question is Closed

caesar27 Group TitleBest ResponseYou've already chosen the best response.0
14. C 15.B
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
what?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
does 15 d have an actual answer?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
i mean a lol
 one year ago

TweT226 Group TitleBest ResponseYou've already chosen the best response.0
tan^2(x)  sin^2(x) sin^2(x)/cos^2(x)  sin^2(x) [sin^2(x)  cos^2(x)sin^2(x)]/cos^2(x) sin^2(x)(1  cos^2(x))/cos^2(x) sin^2(x)sin^2(x)/cos^2(x) tan^2(x)sin^2(x)
 one year ago

Hero Group TitleBest ResponseYou've already chosen the best response.0
\[\tan^2x  \sin^2x = \tan^2x\sin^2x\] \[\frac{\tan^2x  \sin^2x}{\sin^2x} = \tan^2x\] \[\frac{\tan^2x}{\sin^2x}  \frac{\sin^2x}{\sin^2x} = \tan^2x\] \[\frac{\tan^2x}{\sin^2x}  1 = \tan^2x\] \[\frac{\tan^2x}{\sin^2x} = \tan^2x + 1\] \[\frac{\tan^2x}{\sin^2x} = \frac{\sin^2x}{\cos^2x} + \frac{\cos^2x}{\cos^2x}\] \[\frac{\tan^2x}{\sin^2x} = \frac{\sin^2x+\cos^2x}{\cos^2x}\] \[\frac{\tan^2x}{\sin^2x} = \frac{1}{\cos^2x}\] \[\tan^2x = \frac{\sin^2x}{\cos^2x}\] \[\tan^2x = \tan^2x\]
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
but in this kind of problem both sides have to equal to one another, so in this casem @TweT226 is right. but why did you subtract it by 1?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
but thank you for all the work @Hero your work was beautiful!
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
but the answer has to be equal to tan^2xsin^2x
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
but that is the answer, tan^xsin^2x
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
haha yes youre right. lol thank you!
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
do u know how in his way why he subtracted by one though?
 one year ago

TweT226 Group TitleBest ResponseYou've already chosen the best response.0
mine or hero?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
yours
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
14d: work from the right hand side
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
15a. \[\sin ( x  \Theta) = sinx \cos \theta  \sin \theta cosx \] then solve and put theta = pi \[\cos \Pi = 1 \] \[\sin \Pi = 0\] Put that into the equation and obtain sinx
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
i just figured out 15a! thanks!
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
do u know how to change something in polar form? like sqrt(3) + i?
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
14d. i will solve this from the right hand side of the equation: \[\tan ^2 x \sin^2x = \frac{ \sin^2x }{ \cos^2x } \times \left( \sin^2x \right)\] \[= \frac{ \sin^2x }{ \cos^2x } \times ( 1  \cos^2x)\]
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
solve the equation and you will obtain the expression for the RHS
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
i dont understand why you did (1−cos2x)
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
the identity of sin2x = 1cos2x
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
so whenever you see that u change it to (1−cos2x)?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
cause i thought that only applied when you added sin2x + cos2x
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
well you can determine what you will need to convert depending on whats on the other side of the equation. right??
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
solve and let me know how it goes. OK :)
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
okay! hold on!
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
no it still didnt realy work out... here let me try again
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
alright, i will finish the solution
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
can i take a picture of what im doing so u can tell me what im doing wrong
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
\[\frac{ \sin^2x\cos^xsin^2x }{ \cos^2x }\] \[\frac{ \sin^2x }{ \cos^2x }  \frac{ \cos^2xsin^2x }{ \cos^2x }\] \[\frac{ \sin^2x }{ \cos^2x }= \tan^2x\] and : \[\frac{ \cos^2xsin^2x }{ \cos^2x }= \sin^2x\]
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
sure you can! lemme check
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
okay cool! awh thanks!
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
hold onn!
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
I worked on from the RHS.. its much easier to figure out from the RHS but I will try to do it from the LHS as well. it should be the same answer. In the meantime, you can check the solutions i put up
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
okay thank youuu
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
when u did sin2x−cosxsin2xcos2x why isnt it sin2x−cos2xsin2xcos2x?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
why is it sin2x−cosxsin2xcos2x
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
from the top, we can see that its just a multiplication of sin2X and whats in the bracket
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
yeah so shouldnt it be cos2x
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
hang on, I'll upload the solution
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
i know right.. :D got it from my computer.. mind reading it backwards?? :/
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
loll yeah ill try haha
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
or u could take a picture on ur phone or something and email it to yo self! and did u find a common denominator?
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
ook yeah try this
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
LaTex is horrible, i'm much of a "down on paper" breed//
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
ugh ijust dont understand!!! im sorry :(
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
Oh.. ok lets try that again:
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
Solve from the Right Hand Side.. Did you get the solutions up to a certain point?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
yes, and each time i do it i stop at that point
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
where exactly?
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
at the sin2x  sin2xcos2x / cos2x
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
idk what to d after that because i get tan2x sin2xcos2x
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
Oh there' the mistake right there.. you have to divide sin2x by Cos2x as well as divide by sin2xcos2x by cos2x
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
yeah but when i do it i dont have both of those cases thats all i have left
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
Ok i will post the solution from that point
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
\[\frac{ \sin^2x\sin^2xcos^2x }{ \cos^2x }\]
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
\[\frac{ \sin^2x }{ \cos^2x }\frac{ \sin^2xcos^2x }{ \cos^2x }\]
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
solve that..
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
thanks @Hero !!!
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
when i solve that yeah i get the answer but i dont see how u got that :(
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
lol i agree with you but my teacher wont give me credit unless i do it that way
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
she told us if we do it any other way we wont get credit
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.0
You are supposed to get credits for either solving from LHS or RHS
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
yeah i agree im just confused
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.0
i mean i honestly dont mind this way, just this problem..
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.