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

sunnymony Group TitleBest ResponseYou've already chosen the best response.0
prove that this question?
 2 years ago

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

scarydoor Group TitleBest ResponseYou've already chosen the best response.2
What 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.
 2 years ago

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

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

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