Asked by David

I have to show that for any (pi)A, Sin(A)squared + Cos(A)squared = 1.
I don't really get the question... am I supposed to multiply A by pi? Even if that weren't the case, I still do not comprehend how the squared sine and cosine will cancel out... I'd really appreciate some help, please.

Answers

Answered by Count Iblis
Use the definition of sin and cos using a right triangle and then use Pythagoras's formula.
Answered by Audrey
oh, okay, so because a(squared)+b(squared)=c squared, I just substitue for cos sin, thanks.
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