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First transform `sin^2(x)` into `1-cos^2(x)` and obtain
This is a quadratic equation for cos(x), the roots are 2 and 1/2. cos(x) never =2.
cos(x)=1/2 on `(0, 2pi)` at `x_1=pi/3` and `x_2=(5pi)/3.`
The answer: `pi/3` and `(5pi)/3.`
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