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Trigonometric Identities and Equations

Trigonometric Identities and Equations

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Section 11.1 Introduction to Identities 799 Similarly, solving for sin gives us sin 2 1 cos and If and terminates in quadrant II, find cos . Solution We can obtain cos from sin by using the identity If , the identity becomes Substitute for sin . Square to get Subtract. Now we know that cos is either or . Looking back to the original

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