समाकल frac{48}{pi^{4}} int_{0}^{pi} left(frac | vedclass

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(A) माना $I = \frac{48}{\pi^{4}} \int_{0}^{\pi} x^{2} \left(\frac{3 \pi}{2} - x\right) \frac{\sin x}{1 + \cos^{2} x} dx$.गुणधर्म $\int_{0}^{a} f(x) dx

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$6$

Vedclass · Answer

(A) माना $I = \frac{48}{\pi^{4}} \int_{0}^{\pi} x^{2} \left(\frac{3 \pi}{2} - xight) \frac{\sin x}{1 + \cos^{2} x} dx$.गुणधर्म $\int_{0}^{a} f(x) dx = \int_{0}^{a} f(a-x) dx$ का उपयोग करने पर:$I = \frac{48}{\pi^{4}} \int_{0}^{\pi} (\pi-x)^{2} \left(\frac{3 \pi}{2} - (\pi-x)ight) \frac{\sin x}{1 + \cos^{2} x} dx$$I = \frac{48}{\pi^{4}} \int_{0}^{\pi} (\pi-x)^{2} \left(\frac{\pi}{2} + xight) \frac{\sin x}{1 + \cos^{2} x} dx$.$I$ के दोनों व्यंजकों को जोड़ने पर:$2I = \frac{48}{\pi^{4}} \int_{0}^{\pi} \frac{\sin x}{1 + \cos^{2} x} [x^{2}(\frac{3\pi}{2}-x) + (\pi-x)^{2}(\frac{\pi}{2}+x)] dx$.कोष्ठक के अंदर के पद को सरल करने पर:$x^{2}(\frac{3\pi}{2}-x) + (\pi^{2}-2\pi x+x^{2})(\frac{\pi}{2}+x) = \frac{3\pi x^{2}}{2} - x^{3} + \frac{\pi^{3}}{2} + \pi^{2}x - \pi^{2}x - 2\pi x^{2} + \frac{x^{2}\pi}{2} + x^{3} = \frac{\pi^{3}}{2}$.अतः,$2I = \frac{48}{\pi^{4}} \int_{0}^{\pi} \frac{\sin x}{1 + \cos^{2} x} \cdot \frac{\pi^{3}}{2} dx = \frac{24}{\pi} \int_{0}^{\pi} \frac{\sin x}{1 + \cos^{2} x} dx$.माना $\cos x = t$,तब $-\sin x dx = dt$. जब $x=0, t=1$; जब $x=\pi, t=-1$.$2I = \frac{24}{\pi} \int_{1}^{-1} \frac{-dt}{1+t^{2}} = \frac{24}{\pi} \int_{-1}^{1} \frac{dt}{1+t^{2}} = \frac{24}{\pi} [	an^{-1} t]_{-1}^{1} = \frac{24}{\pi} (\frac{\pi}{4} - (-\frac{\pi}{4})) = \frac{24}{\pi} \cdot \frac{\pi}{2} = 12$.इसलिए,$I = 6$.

समाकल $\frac{48}{\pi^{4}} \int_{0}^{\pi} \left(\frac{3 \pi x^{2}}{2} - x^{3}\right) \frac{\sin x}{1 + \cos^{2} x} dx$ का मान किसके बराबर है?

Similar Questions

कथन $(A)$: $\int_{\frac{\pi}{6}}^{\frac{\pi}{3}} \frac{(\sin x)^{\sqrt{2}} dx}{(\sin x)^{\sqrt{2}}+(\cos x)^{\sqrt{2}}} = \frac{\pi}{12}$
कारण $(R)$: $\int_{a}^{b} \frac{f(x) dx}{f(x)+f(a+b-x)} = \frac{b-a}{2}$

$\int_{-1}^{1} \log(x + \sqrt{x^2 + 1}) \, dx = $

यदि $M = \int_{0}^{\pi / 2} \frac{\cos x}{x+2} dx$ और $N = \int_{0}^{\frac{\pi}{4}} \frac{\sin x \cos x}{(x+1)^{2}} dx$ है, तो $M-N$ का मान ज्ञात कीजिए।

निश्चित समाकलनों के गुणों का उपयोग करके,$\int_{0}^{\frac{\pi}{2}} \frac{\sin x-\cos x}{1+\sin x \cos x} d x$ का मान ज्ञात कीजिए।

यदि $\int \limits_0^1 \frac{1}{\left(5+2 x -2 x ^2\right)\left(1+ e ^{(2-4 x)}\right)} dx =\frac{1}{\alpha} \log _{ e }\left(\frac{\alpha+1}{\beta}\right)$ जहाँ $\alpha, \beta > 0$,तो $\alpha^4-\beta^4$ का मान ज्ञात कीजिए:

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