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For what values of x does the graph of f have a horizontal tangent? (Use n as your integer variable. Enter your answers as a comma-separated list.)
f(x) = x − 2 sin x

  • calculus -

    horizontal tangent means slope = 0

    f'(x) = 1 - 2cosx
    cosx = 1/2
    x = 2kpi +/- pi/3

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