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Question Number 136406 by mathmax by abdo last updated on 21/Mar/21

$$\mathrm{calculate}{\mathrm{A}}_{\lambda }={\int }_0^{\mathrm{\infty }}\frac{{\cos }^4\mathrm{x}}{{({\mathrm{x}}^2+{\lambda }^2)}^2}\mathrm{dx}$$$$2)\mathrm{find}\mathrm{the}\mathrm{value}\mathrm{of}{\int }_0^{\mathrm{\infty }}\frac{{\cos }^4\mathrm{x}}{{({\mathrm{x}}^2+3)}^2}\mathrm{dx}$$

Commented by mathmax by abdo last updated on 21/Mar/21

$$\lambda >0$$

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