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

User Orjan
by
6.4k points

1 Answer

1 vote
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
User Chris Mitchell
by
5.9k points
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