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OpenStudy (anonymous):
For what value of x does the graph of f have a horizontal tangent? f(x) = 2 sin(x) + sin^2 (x)
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OpenStudy (tkhunny):
Sounds like a job for a 1st Derivative. What do you get for f'(x)?
OpenStudy (anonymous):
er f'(x) = 2cos x + 2sin *cos x
OpenStudy (tkhunny):
Where does f'(x) take on the value zero (0)?
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