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

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asked Jun 27, 2018 63.2k views

1 Answer

Chris Mitchell · Answer 1 · 2018-06-30T22:41:09+0000

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

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

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