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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?
 one year ago

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

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

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