Asked by Sarah

Determine the points in the interval (0, 2π) at which the graph of the function below has a horizontal tangent line.

f(x) = 10 cos x + 5 sin 2x


There should be three

Answers

Answered by Steve
yeah - where f'(x) = 0

f'(x) = -10sinx + 10cos2x
now just find where that is zero
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