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verifying identities precalculus

Verify the identity: sec^(2)u - cot^2(pie/2 - u)

Convert the secant and cotangent functions to their sine and cosine equivalenst. Then apply the fact that:

$<br /> \cos(\frac {\pi} 2 - x) = \sin (x) \\<br /> \sin (\frac {\pi} 2 - x) = \cos (x)<br />$

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