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OpenStudy (anonymous):
what basic trigonometric identity would you use to verify that sin^2 x + cos^2 x/ cos x = sec x? a. sin x = 1/csc x b. 1 + cot^2 x = csc^2 x c. cos^2 x + sin^2 x = 1 d. cos x = 1/sec x
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OpenStudy (anonymous):
Third one
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