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Category: Integration

find-3-2x-1-dx-

Question Number 29455 by prof Abdo imad last updated on 08/Feb/18 $${find}\:\int\:\:\mathrm{3}^{\sqrt{\mathrm{2}{x}+\mathrm{1}}} \:{dx}\:. \\ $$ Commented by prof Abdo imad last updated on 12/Feb/18 $${the}\:{ch}.\:\sqrt{\mathrm{2}{x}+\mathrm{1}}\:={t}\:{give}\:\mathrm{2}{x}+\mathrm{1}={t}^{\mathrm{2}}…

find-dx-sinx-sin-2x-

Question Number 29445 by prof Abdo imad last updated on 08/Feb/18 $${find}\:\:\:\int\:\:\:\:\:\:\:\frac{{dx}}{{sinx}\:+{sin}\left(\mathrm{2}{x}\right)}\:. \\ $$ Answered by mrW2 last updated on 09/Feb/18 $$=\int\frac{{dx}}{\mathrm{sin}\:{x}\left(\mathrm{1}+\mathrm{2cos}\:{x}\right)} \\ $$$$=\int\frac{\mathrm{sin}\:{x}\:{dx}}{\mathrm{sin}^{\mathrm{2}} \:{x}\left(\mathrm{1}+\mathrm{2cos}\:{x}\right)}…