find an equivalent expression.

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1051

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cos(x+pi/2)

Guest Dec 9, 2015

CPhill · Answer 1 · 2015-12-09T08:41:27

cos(x + pi/2) = cos(x)cos(pi/2) - sin(x)sin(pi/2) = cos(x)* (0) - sin(x)* (1) = - sinx