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anteater
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sec x = 1/cos x, and 1/sec^2 x = (1/sec x)(1/sec x) = ?

anteater
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Sorry, I left something out. :) sec x = 1/cosx , so 1/sec x = 1/(1/cos x) = cos x

anteater
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And so 1/sec^2 x = ?

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cos^2 x ;)