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Category: Integration

Question-167400

Question Number 167400 by infinityaction last updated on 15/Mar/22 Answered by Mathspace last updated on 16/Mar/22 $${I}=\frac{\pi}{\mathrm{2}}{ln}\mathrm{2}\:+\int_{\mathrm{0}} ^{\frac{\pi}{\mathrm{2}}} {ln}\left(\mathrm{1}+\frac{\mathrm{1}}{\mathrm{2}}{cosx}\right){dx} \\ $$$$=\frac{\pi}{\mathrm{2}}{ln}\mathrm{2}\:+{f}\left(\frac{\mathrm{1}}{\mathrm{2}}\right)\:{with}\:{f}\left({a}\right)=\int_{\mathrm{0}} ^{\frac{\pi}{\mathrm{2}}} {ln}\left(\mathrm{1}+{acosx}\right){dx} \\ $$$${we}\:{take}\:\mathrm{0}<{a}\leqslant\mathrm{1}…

1-1-1-x-1-x-dx-

Question Number 101833 by bobhans last updated on 05/Jul/20 $$\int\:_{−\mathrm{1}} ^{\mathrm{1}} \sqrt{\frac{\mathrm{1}+{x}}{\mathrm{1}−{x}}}\:{dx}\:?\: \\ $$ Answered by Dwaipayan Shikari last updated on 05/Jul/20 $$\int_{−\mathrm{1}} ^{\mathrm{1}} \frac{\mathrm{1}+{x}}{\:\sqrt{\mathrm{1}−{x}^{\mathrm{2}}…

0-pi-2-cos-x-cos-5-x-sin-x-1-cos-2-x-dx-

Question Number 167328 by cortano1 last updated on 13/Mar/22 $$\:\:\:\:\:\:\int_{\mathrm{0}} ^{\:\pi/\mathrm{2}} \:\frac{\mathrm{cos}\:{x}+\mathrm{cos}\:^{\mathrm{5}} {x}\:\mathrm{sin}\:{x}}{\:\sqrt{\mathrm{1}+\mathrm{cos}\:^{\mathrm{2}} {x}}}\:{dx}\:=? \\ $$ Answered by MJS_new last updated on 13/Mar/22 $$\int\frac{\mathrm{cos}\:{x}\:+\mathrm{cos}^{\mathrm{5}} \:{x}\:\mathrm{sin}\:{x}}{\:\sqrt{\mathrm{1}+\mathrm{cos}^{\mathrm{2}}…