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sunnymony
 3 years ago
how sin2a +cos2a =1
sunnymony
 3 years ago
how sin2a +cos2a =1

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hubertH
 3 years ago
Best ResponseYou've already chosen the best response.0what is the question must u prove that the RHS=LHS?

sunnymony
 3 years ago
Best ResponseYou've already chosen the best response.0prove that this question?

scarydoor
 3 years ago
Best ResponseYou've already chosen the best response.2you mean sin^2 a + cos^2 a = 1.

scarydoor
 3 years ago
Best ResponseYou've already chosen the best response.2What I do is remember how sin and cos can be thought of as coming out of the unit sphere, with certain angles, and forming a right angle triangle from the angle, etc. Then you just have pythagoras' theorem.

scarydoor
 3 years ago
Best ResponseYou've already chosen the best response.2dw:1353754710511:dw

asnaseer
 3 years ago
Best ResponseYou've already chosen the best response.2you can actually prove it on any rightangled triangle by drawing it as follows: dw:1353754910236:dw

asnaseer
 3 years ago
Best ResponseYou've already chosen the best response.2then use definition of sin(theta) and cos(theta) and pythagorus to prove it
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