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∫dx(a2−x2)3/2\int \frac{dx}{(a^2-x^2)^{3/2}} is equal to: (where C is an arbitrary constant)

Solution

✅ Correct Option: 2

Put x=asin⁡θx = a\sin\theta, dx=acos⁡θ dθdx = a\cos\theta\,d\theta. The integral becomes 1a2∫sec⁡2θ dθ=tan⁡θa2\frac{1}{a^2}\int\sec^2\theta\,d\theta = \frac{\tan\theta}{a^2}. Back-substituting, tan⁡θ=x/a2−x2\tan\theta = x/\sqrt{a^2-x^2}, so the answer is xa2a2−x2+C\frac{x}{a^2\sqrt{a^2-x^2}} + C.

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