### Slope of the Tangent: find x so the slope of the tangent to f(x)=sinxtanx is zero.

A http://www.door2math.com production. Dr. Pan makes learning math Fun. Derivative of tanx question? Determine all the values of x, between 0 and 2pi, for which the slope of the tangent to f(x)=sinxtanx is zero.

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