Question Number 23972 by Sudipta Jana last updated on 10/Nov/17
$$\int_{\mathrm{0}} ^{\mathrm{90}} \frac{\mathrm{sin}\:^{\mathrm{2}} {x}}{\mathrm{sin}\:^{\mathrm{4}} {x}+\mathrm{cos}\:^{\mathrm{4}} {x}}{dx} \\ $$
0-90-sin-2-x-sin-4-x-cos-4-x-dx-