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.

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  1. Use the definition of sin and cos using a right triangle and then use Pythagoras's formula.

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  2. oh, okay, so because a(squared)+b(squared)=c squared, I just substitue for cos sin, thanks.

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