int_0^{pi / 4} [sqrt{tan x} + sqrt{cot x}] , | vedclass

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(A) Let $I = \int_0^{\pi / 4} (\sqrt{	an x} + \sqrt{\cot x}) \, dx$. $I = \int_0^{\pi / 4} \left( \frac{\sqrt{\sin x}}{\sqrt{\cos x}} + \frac{\sqrt{\

Vedclass · Accepted Answer

$\frac{\pi}{\sqrt{2}}$

Vedclass · Answer

(A) Let $I = \int_0^{\pi / 4} (\sqrt{	an x} + \sqrt{\cot x}) \, dx$. $I = \int_0^{\pi / 4} \left( \frac{\sqrt{\sin x}}{\sqrt{\cos x}} + \frac{\sqrt{\cos x}}{\sqrt{\sin x}} ight) \, dx$. $I = \int_0^{\pi / 4} \frac{\sin x + \cos x}{\sqrt{\sin x \cos x}} \, dx$. Multiply numerator and denominator by $\sqrt{2}$: $I = \int_0^{\pi / 4} \frac{\sqrt{2}(\sin x + \cos x)}{\sqrt{2 \sin x \cos x}} \, dx = \sqrt{2} \int_0^{\pi / 4} \frac{\sin x + \cos x}{\sqrt{1 - (\sin x - \cos x)^2}} \, dx$. Let $t = \sin x - \cos x$, then $dt = (\cos x + \sin x) \, dx$. When $x = 0$, $t = -1$. When $x = \pi/4$, $t = 0$. $I = \sqrt{2} \int_{-1}^0 \frac{dt}{\sqrt{1 - t^2}} = \sqrt{2} [\sin^{-1} t]_{-1}^0$. $I = \sqrt{2} [\sin^{-1}(0) - \sin^{-1}(-1)] = \sqrt{2} [0 - (-\pi/2)] = \sqrt{2} \cdot \frac{\pi}{2} = \frac{\pi}{\sqrt{2}}$.

$\int_0^{\pi / 4} [\sqrt{\tan x} + \sqrt{\cot x}] \, dx$ is equal to

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