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hubertHBest ResponseYou've already chosen the best response.0
what is the question must u prove that the RHS=LHS?
 one year ago

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

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

scarydoorBest 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

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

asnaseerBest 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

asnaseerBest 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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