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CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

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Question : 20 of 29
Marks: +1, -0
Prove that 0af(x)dx=0af(ax)dx\int\limits_{0}^{a} f(x) \, dx = \int\limits_{0}^{a} f(a-x) \, dx, hence evaluate 0π  xsinx1+cos2xdx\int\limits_{0}^{\pi} \; \frac{x \sin x}{1+\cos^2 x} \, dx.
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