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OpenStudy (anonymous):
Why would knowing the Pythagorean Identity sin^x + cos^x =1 and the sum identities allow you to prove all the other identities (sum and difference, double angle, half angle, squared identities, product to sum) you have seen in this lesson?
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OpenStudy (unklerhaukus):
you mean of course \[sin^2x+cos^2x=1\]
OpenStudy (anonymous):
course?
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