$\Large\int \frac {\sin^2xdx}{a^2\cos ^2x+b^2\sin^2x \sin^2 x} =$ $$\begin{array}{1 1}(a)\;(b-a)log(a^2\cos ^2x+b^2\sin^2x) & \quad (b)\;\frac{1}{b-a}log(a^2\cos ^2x+b^2\sin^2x) & \\(c)\;\frac{1}{b^2-a^2}log(a^2\cos ^2x+b^2\sin^2x) & \quad(d)\;\frac{1}{a^2+b^2}log(a^2\cos ^2x+b^2\sin^2x)\end{array}$$

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