write the Pythagorean relation between sec A cos A tan A
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The proof of the Pythagorean identity for sine and cosine is essentially just drawing a right triangle in a unit circle, identifying the cosine as the x coordinate, the sine as the y coordinate and 1 as the hypotenuse. The two other Pythagorean identities are: 1+cot2x=csc2x. tan2x+1=sec2x.
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