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3.3 · Q146

Q.Evaluate: ∫esin⁡−1x⋅x+1−x21−x2 dx\int e^{\sin^{-1}x}\cdot\frac{x+\sqrt{1-x^2}}{\sqrt{1-x^2}}\,dx

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Let t=sin⁡−1xt=\sin^{-1}x, so x=sin⁡tx=\sin t, 1−x2=cos⁡t\sqrt{1-x^2}=\cos t, dx=cos⁡t dtdx=\cos t\,dt:

∫esin⁡−1x⋅x+1−x21−x2 dx=∫et⋅sin⁡t+cos⁡tcos⁡t⋅cos⁡t dt=∫et(sin⁡t+cos⁡t) dt\int e^{\sin^{-1}x}\cdot\dfrac{x+\sqrt{1-x^2}}{\sqrt{1-x^2}}\,dx=\int e^t\cdot\dfrac{\sin t+\cos t}{\cos t}\cdot\cos t\,dt=\int e^t(\sin t+\cos t)\,dt …

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