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To do this it is usually useful to convert the addition or subtraction terms in terms of one trigonometric function and then evaluate....\u003c/span\u003e\n\u003cspan class='full-description hide'\u003e👉 Learn how to verify trigonometric identities involving the addition and subtraction of terms. To do this it is usually useful to convert the addition or subtraction terms in terms of one trigonometric function and then evaluate. 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