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

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22-02-2017
Mathematics

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

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apologiabiology apologiabiology · Answer 1 · 2017-02-22T09:34:47+01:00

apologiabiology apologiabiology

22-02-2017

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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