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Posted by Robin on Tuesday, June 18, 2013 at 10:39am.

For what values of x with 0¡Üx¡Ü2¦Ð does the graph of f(x)=x+4sin(x) have a horizontal tangent?

f(x) = x+4sin x f'(x) = 1 + 4cos x So, where is cos x = -1/4?

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