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9 August, 02:24

Find the values of x on the curve y = cos x 2 sin x at which the tangent is horizontal.

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  1. 9 August, 02:44
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    Assuming you mean y=2cos (x) sin (x)

    take deritive

    use chain rule

    4 (cos (x)) ²-2

    find where it equals 0

    it equals 0 at pi/4 and 3pi/4 and every interval that is pi/2 aparrt
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