int_{-pi}^pi frac{x sin x}{1+cos ^2 x} d x= | vedclass

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(A) माना $f(x) = \frac{x \sin x}{1+\cos^2 x}$.चूंकि $f(-x) = \frac{(-x) \sin(-x)}{1+\cos^2(-x)} = \frac{(-x)(-\sin x)}{1+\cos^2 x} = f(x)$,अतः फलन सम

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$\frac{\pi^2}{2}$

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(A) माना $f(x) = \frac{x \sin x}{1+\cos^2 x}$.चूंकि $f(-x) = \frac{(-x) \sin(-x)}{1+\cos^2(-x)} = \frac{(-x)(-\sin x)}{1+\cos^2 x} = f(x)$,अतः फलन सम (even) है।गुणधर्म $\int_{-a}^a f(x) dx = 2 \int_0^a f(x) dx$ का उपयोग करने पर,$I = 2 \int_0^\pi \frac{x \sin x}{1+\cos^2 x} dx$.गुणधर्म $\int_0^a f(x) dx = \int_0^a f(a-x) dx$ का उपयोग करने पर,$I = 2 \int_0^\pi \frac{(\pi-x) \sin(\pi-x)}{1+\cos^2(\pi-x)} dx = 2 \int_0^\pi \frac{(\pi-x) \sin x}{1+\cos^2 x} dx$.दोनों समीकरणों को जोड़ने पर:$2I = 2 \int_0^\pi \frac{\pi \sin x}{1+\cos^2 x} dx \Rightarrow I = \pi \int_0^\pi \frac{\sin x}{1+\cos^2 x} dx$.माना $t = \cos x$,तब $dt = -\sin x dx$। सीमाएं $0$ से $\pi$ बदलकर $1$ से $-1$ हो जाएंगी।$I = \pi \int_1^{-1} \frac{-dt}{1+t^2} = \pi \int_{-1}^1 \frac{dt}{1+t^2} = 2\pi \int_0^1 \frac{dt}{1+t^2}$.$I = 2\pi [	an^{-1} t]_0^1 = 2\pi (\frac{\pi}{4} - 0) = \frac{\pi^2}{2}$.

$\int_{-\pi}^\pi \frac{x \sin x}{1+\cos ^2 x} d x=$

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