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12 September, 13:38

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

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  1. 12 September, 15:54
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    F' (x) = 1-2cosx

    Thus to have a horizontal tangent, 1-2cosx=0x=1/3 (-π+6 n π) x=1/3 (+π+6 n π) where n is an integer
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