$\int \frac{\sin 2x \cos 2x \, dx}{\sqrt{9-\cos^{4}(2x)}}$ શોધો.

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(NONE) ધારો કે $I = \int \frac{\sin 2x \cos 2x \, dx}{\sqrt{9-\cos^{4}(2x)}}$.
$t = \cos^{2}(2x)$ આદેશ લેતા.
તેથી,$dt = 2 \cos(2x) \cdot (-\sin(2x)) \cdot 2 \, dx = -4 \sin(2x) \cos(2x) \, dx$.
આથી $\sin(2x) \cos(2x) \, dx = -\frac{1}{4} dt$ મળે.
આ કિંમતો સંકલનમાં મૂકતા:
$I = \int \frac{-\frac{1}{4} dt}{\sqrt{9-t^{2}}} = -\frac{1}{4} \int \frac{dt}{\sqrt{3^{2}-t^{2}}}$.
પ્રમાણિત સંકલન સૂત્ર $\int \frac{dx}{\sqrt{a^{2}-x^{2}}} = \sin^{-1}(\frac{x}{a}) + C$ નો ઉપયોગ કરતા:
$I = -\frac{1}{4} \sin^{-1}\left(\frac{t}{3}\right) + C$.
$t = \cos^{2}(2x)$ પાછા મૂકતા:
$I = -\frac{1}{4} \sin^{-1}\left(\frac{\cos^{2}(2x)}{3}\right) + C$.

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