Re: Sum of squares

Hmm okay, I see the counter example. But my book has the following:

a^2 + b^2 = 1

It then uses cos^2(t) + sin^2(t) = 1

and says there is some angle t such that

a^2 = cos^2(t)

b^2 = sin^2(t)

How is this justified?

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