Factor each expression completely. (a) x² - y2 (b) cos? e - sin² e

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A: sin-1(32)=π3sin-1(32)=60°

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Q: Factor each expression completely.     a. x 2- y2b. cos 2 theta - sin 2 theta

A: (a) x2-y2 = x-yx+y                Using, a2-b2=a-ba+b

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