Question
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
f(x) = 10 cos x + 5 sin 2x
There should be three
Answers
Steve
yeah - where f'(x) = 0
f'(x) = -10sinx + 10cos2x
now just find where that is zero
f'(x) = -10sinx + 10cos2x
now just find where that is zero