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Trigonometry Question

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superjags99 | 20:02 Tue 26th Jun 2007 | Science
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How do you simplify the expression (1 � sec q)(1 + sec q).? q = theta
i'm taking an online trig class and the movies they give you don't help out at all.
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(1-sec q)(1+sec q) = 1- sec^2 q = - tan^2 q.

movies ??? the mind boggles !

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