Use basic trigonometric identities to simplify the expression: sin (−x) cos (−x)

Algebra
Tutor: None Selected Time limit: 1 Day

please explain!

Jul 9th, 2015

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sin(-x0 = -sinx, cos(-x) = cosx

sin(-x) cos(-x)  = -sinx cosx = -1/2 sin2x. 

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Jul 9th, 2015

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