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OpenStudy (anonymous):
Simplify the expression. sin^2 x-1/cos(-x)
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OpenStudy (anonymous):
sin²x/(1 - cosx) = 1 + cosx sin²x = (1 + cosx)(1 - cosx) sin²x = 1 - cos²x sin²x + cos²x = 1
OpenStudy (anonymous):
-sin x cos x sin x -cos x those are my choices
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