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Category: Integration

sin-50x-sin-49-x-dx-

Question Number 84163 by john santu last updated on 10/Mar/20 $$\int\:\mathrm{sin}\:\left(\mathrm{50}{x}\right)\:\mathrm{sin}\:^{\mathrm{49}} \left({x}\right)\:{dx}\:? \\ $$ Answered by jagoll last updated on 10/Mar/20 $$\mathrm{sin}\:\mathrm{50x}\:=\:\mathrm{sin}\:\mathrm{49x}\:\mathrm{cos}\:\mathrm{x}\:+\:\mathrm{cos}\:\mathrm{49x}\:\mathrm{sin}\:\mathrm{x} \\ $$$$\int\:\mathrm{sin}\:^{\mathrm{49}} \mathrm{x}\:\mathrm{sin}\:\mathrm{49x}\:\mathrm{cos}\:\mathrm{x}\:\mathrm{dx}\:+…

solve-1-0-ln-2-e-x-e-4-x-2-dx-pi-k-e-2-k-2-0-ln-3-x-e-2

Question Number 149673 by mnjuly1970 last updated on 06/Aug/21 $$\:\:\:\mathrm{solve}\::: \\ $$$$\left[\:\mathrm{1}\right]\:\:\:\:\boldsymbol{\phi}\::=\:\int_{\mathrm{0}} ^{\:\:\infty\:} \frac{{ln}^{\:\mathrm{2}} \:\left({e}\:{x}\:\right)}{{e}^{\:\mathrm{4}} \:+{x}^{\:\mathrm{2}} }\:{dx}\:=\frac{\pi\:{k}}{{e}^{\:\mathrm{2}} } \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:{k}:=\:? \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\: \\ $$$$\:\:\:\:\left[\:\mathrm{2}\:\right]\:\:\:\Omega\::=\:\int_{\mathrm{0}\:} ^{\:\infty}…

find-the-area-between-the-function-y-2sin2x-1-and-the-x-axis-on-pi-pi-2-

Question Number 84135 by M±th+et£s last updated on 09/Mar/20 $${find}\:{the}\:{area}\:{between}\:{the}\:{function}\: \\ $$$${y}=\mathrm{2}{sin}\mathrm{2}{x}\:−\mathrm{1}\:{and}\:\:{the}\:{x}−{axis}\:\:{on}\:\left[−\pi,\frac{\pi}{\mathrm{2}}\right] \\ $$ Answered by Rio Michael last updated on 09/Mar/20 $$\int_{−\pi} ^{\frac{\pi}{\mathrm{2}}} \left(\mathrm{2sin}\:\mathrm{2}{x}−\mathrm{1}\right){dx}…

sin-x-1-cos-2-x-dx-

Question Number 18590 by Joel577 last updated on 25/Jul/17 $$\int\:\frac{\mathrm{sin}\:{x}}{\mathrm{1}\:+\:\mathrm{cos}^{\mathrm{2}} \:{x}}\:{dx} \\ $$ Answered by Arnab Maiti last updated on 25/Jul/17 $$\mathrm{put}\:\mathrm{cos}\:\mathrm{x}=\mathrm{z} \\ $$$$\:\:\:\:\:−\mathrm{sin}\:\mathrm{x}\:\mathrm{dx}=\mathrm{dz} \\…

x-4-1-x-4-dx-

Question Number 84106 by jagoll last updated on 09/Mar/20 $$\int\:\frac{\mathrm{x}^{\mathrm{4}} }{\:\sqrt{\mathrm{1}−\mathrm{x}^{\mathrm{4}} }}\:\mathrm{dx}\:=\:? \\ $$ Commented by MJS last updated on 09/Mar/20 $${t}=\sqrt{\mathrm{sin}\:{x}}\:\rightarrow\:{dx}=\frac{\sqrt{\mathrm{1}−{x}^{\mathrm{4}} }}{\mathrm{2}{x}}{dt} \\ $$$$\frac{\mathrm{1}}{\mathrm{2}}\int\left(\mathrm{sin}\:{t}\right)^{\frac{\mathrm{3}}{\mathrm{2}}}…

Find-the-reduction-formula-x-n-e-ax-dx-

Question Number 84101 by niroj last updated on 09/Mar/20 $$\:\boldsymbol{\mathrm{Find}}\:\boldsymbol{\mathrm{the}}\:\boldsymbol{\mathrm{reduction}}\:\boldsymbol{\mathrm{formula}} \\ $$$$\:\:\int\boldsymbol{\mathrm{x}}^{\boldsymbol{\mathrm{n}}} \boldsymbol{\mathrm{e}}^{\boldsymbol{\mathrm{ax}}} \:\boldsymbol{\mathrm{dx}} \\ $$ Answered by MJS last updated on 09/Mar/20 $$\int{x}^{{n}} \mathrm{e}^{{ax}}…

1-0-2pi-1-a-sin-t-dt-a-gt-0-2-2pi-4pi-1-2-sin-t-dt-

Question Number 149625 by puissant last updated on 06/Aug/21 $$\left.\mathrm{1}\right)\int_{\mathrm{0}} ^{\mathrm{2}\pi} \frac{\mathrm{1}}{\mathrm{a}+\mathrm{sin}\left(\mathrm{t}\right)}\mathrm{dt}\:,\:\mathrm{a}>\mathrm{0} \\ $$$$\left.\mathrm{2}\right)\int_{\mathrm{2}\pi} ^{\mathrm{4}\pi} \frac{\mathrm{1}}{\mathrm{2}+\mathrm{sin}\left(\mathrm{t}\right)}\mathrm{dt}.. \\ $$ Answered by ArielVyny last updated on 06/Aug/21…