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Where, on the interval [0, 2π], does the following function have a horizontal tangent line? f(x) = 19 cos(x) + 10x f(x)

Posted: Tue Jun 07, 2022 7:13 am
by answerhappygod
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Where, on the interval [0, 2π], does the following function have a horizontal tangent line? f(x) = 19 cos(x) + 10x f(x) has horizontal tangents at a =