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**1. Homework Statement**

Find all points on the graph of the function at which the tangent line is horizontal.

f(x) = 2sinx + (sinx)^2

**2. Homework Equations**

Hi guys I have an issue. I do not know how to approach this problem.

I know the chain rule but I still do not know how to solve the prolem.

Thank you for your help.

**3. The Attempt at a Solution**