Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Try factoring
 one year ago

Babybee24 Group TitleBest ResponseYou've already chosen the best response.1
I factored a cos(x) out but then im stuck
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
cos(x)( ? + ? ) =0 So what should be in the places of those ?'s once you factor out cos(x)?
 one year ago

Babybee24 Group TitleBest ResponseYou've already chosen the best response.1
cos(x)(cosx+sinx)
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Yes. Set both factors equal to 0. cos(x)=0 ; cos(x)+sin(x)=0
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Solve cos(x)=0 for x And find the value x so that cos(x) and sin(x) are opposites (i.e cos(x)=sin(x))
 one year ago

Babybee24 Group TitleBest ResponseYou've already chosen the best response.1
cosx=pie/2 ?
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
cos(x)=0 for x=pi/2 cos(x) does not equal pi/2 But one value that satisfies cos(x)=0 is x=pi/2 Are there any other values?
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Ok and you can also say we have x=pi/2+2npi where n is an integer or x=3pi/2+2n pi where n is an integer
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
We also need to find the values of x where cos(x) and sin(x) have opposite values.
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
dw:1357920385873:dw As you can see they will be opposite in quadrant 2 and 4.
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
dw:1357920430907:dw These points is where cos(x) and sin(x) are opposite. Now what angle are these points at from the initial ray?
 one year ago

Babybee24 Group TitleBest ResponseYou've already chosen the best response.1
135 and 315?
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Correct.
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Now should your answer be in radians or degrees?
 one year ago

Babybee24 Group TitleBest ResponseYou've already chosen the best response.1
um radians?
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
So 135*pi/180 or 315*pi/180
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Don't forget we can go around the circle infinitely many times from those angles.
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
So 135pi/180+2npi , 315pi/180+2npi
 one year ago

myininaya Group TitleBest ResponseYou've already chosen the best response.0
Don't forget the other solutions we wrote above. Good job. :)
 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.