2) which expression is equivalent to (sin x+1) (sin x -1)? A. Cos^2x B. -cos^2x C. Cos^2x+1 D. Cos^2x-1 E. -cos^2x-1
|w| = √(8^2+15^2) = 17 since (sin+1)(sin-1) = sin^2 - 1 and cos^2 = 1-sin^2, you have -cos^2 x
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