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OpenStudy (anonymous):
simplify sec^2(theta) times cos^2(theta) - tan^2(theta)
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OpenStudy (anonymous):
sec^2(theta) = 1/(cos^2(theta)) So sec^2(theta)*cos^2(theta) - tan^2(theta) = (1/(cos^2(theta)))*cos^2(theta) - tan^2(theta) = 1 - tan^2(theta)
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