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OpenStudy (ttop0816):
sin^2θ - secθcosθ + cos^2θ= ??
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OpenStudy (anonymous):
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OpenStudy (usukidoll):
sin^2x + cos2^x = 1 identity then you can convert secx to 1/cos x cosx (1/cosx ) = 1 1-1 = 0
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