For real numbers alpha, beta, gamma and delta | vedclass

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(A) Let $I = \int \frac{(x^2-1) dx}{(x^4+3x^2+1) 	an^{-1}(x+1/x)} + \int \frac{dx}{x^4+3x^2+1}$.Divide numerator and denominator by $x^2$ in both int

Vedclass · Accepted Answer

$6$

Vedclass · Answer

(A) Let $I = \int \frac{(x^2-1) dx}{(x^4+3x^2+1) 	an^{-1}(x+1/x)} + \int \frac{dx}{x^4+3x^2+1}$.Divide numerator and denominator by $x^2$ in both integrals.$I = \int \frac{(1-1/x^2) dx}{((x+1/x)^2+1) 	an^{-1}(x+1/x)} + \frac{1}{2} \int \frac{(1+1/x^2) - (1-1/x^2) dx}{(x^2+1/x^2+3)}$.Let $t = 	an^{-1}(x+1/x)$,then $dt = \frac{1}{1+(x+1/x)^2} (1-1/x^2) dx$.$I = \int \frac{dt}{t} + \frac{1}{2} \int \frac{1+1/x^2}{(x-1/x)^2+5} dx - \frac{1}{2} \int \frac{1-1/x^2}{(x+1/x)^2+1} dx$.$I = \log_e |t| + \frac{1}{2} \int \frac{dy}{y^2+5} - \frac{1}{2} \int \frac{dz}{z^2+1}$,where $y=x-1/x$ and $z=x+1/x$.$I = \log_e |	an^{-1}(x+1/x)| + \frac{1}{2\sqrt{5}} 	an^{-1}(\frac{x-1/x}{\sqrt{5}}) - \frac{1}{2} 	an^{-1}(x+1/x) + C$.Comparing with the given form,$\alpha=1, \beta=\frac{1}{2\sqrt{5}}, \gamma=\frac{1}{\sqrt{5}}, \delta=-\frac{1}{2}$.Then $10(\alpha+\beta\gamma+\delta) = 10(1 + \frac{1}{2\sqrt{5}} \cdot \frac{1}{\sqrt{5}} - \frac{1}{2}) = 10(1 + \frac{1}{10} - \frac{1}{2}) = 10(\frac{10+1-5}{10}) = 6$.

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