A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing

This Question is Closed

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1Prove : \(\sin (90  \theta) = \cos \theta\)

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1Actually I am confused that how can I : prove that sin in 2nd quadrant is +ve ? That is my basic confusion ...

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8can u use sin (AB) formula?

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1No idea. Actually that was just in start and the formula arises later, so I think that there must be an easier method?

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1:( not so good but OK ? :)

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1350046739720:dw nothing is there without naming , OK now I think.

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8dw:1350046691525:dw now find sin 90theta and cos theta using basic defination

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1In case of sin 90  theta , will perpendicular be : adjacent (base) and base will be opposite?

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8know the basic defination of sin and cos ? dw:1350046897401:dw apply it here, in terms of a and b,c

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1OH IT IS soh cah toa and not soa cah toa , sorry :(

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1sin = opposite / hypotenuse cos = adjacent / hypotenuse

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1sin (90theta) = b/c cos (theta) = b/c and hence sin(90theta) = cos(theta) , got it now? lol jk. Well is this right @hartnn

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1prove that sin in 2nd quadrant is +ve ? That is my basic confusion ...

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8here, put theta = theta

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8and use cos(theta) = cos theta

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1how to prove that cos(theta)=theta ?

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1again with the use of right triangle @hartnn ?

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8how will u find theta in triangle ?

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1oh yes .. silly me . So, a cartesian plane ?

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1no, cartesian plane will not work also.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.1ccw : +ve angle cw : ve angle

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8because lengths will be positive , so ratio will always come out to be positive, hence, maybe cartesian plane won't work

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1searched net now, http://www.mathsisfun.com/algebra/trigfourquadrants.html is that the correct one ?

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8yes, its correct....we could prove it using coordinates.... (cos t,sin t)= (x,y) so sin t is +ve in 2nd quadrant

mathslover
 2 years ago
Best ResponseYou've already chosen the best response.1doubts ended :) thanks a lo.

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8mathisfun is always a nice reference....

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.1more we knw more confuse we become

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.8more we practice, more the confusion vanishes....

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.1more we practice, more ways we look at things n hence more confusions which ofcourse gives kick ;p
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
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.