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Question Number 41174 by Tawa1 last updated on 02/Aug/18 Answered by MJS last updated on 03/Aug/18 $$\int\mathrm{e}^{{x}\mathrm{sin}\:{x}\:+\mathrm{cos}\:{x}} \left(\mathrm{cos}^{\mathrm{2}} \:{x}\:−\frac{\mathrm{sin}\:{x}}{{x}}−\frac{\mathrm{cos}\:{x}}{{x}^{\mathrm{2}} }\right){dx}= \\ $$$$\int\mathrm{e}^{{x}\mathrm{sin}\:{x}\:+\mathrm{cos}\:{x}} \mathrm{cos}^{\mathrm{2}} \:{x}\:{dx}−\int\frac{\mathrm{e}^{{x}\mathrm{sin}\:{x}\:+\mathrm{cos}\:{x}} \mathrm{sin}\:{x}}{{x}}{dx}−\int\frac{\mathrm{e}^{{x}\mathrm{sin}\:{x}\:+\mathrm{cos}\:{x}}…
Question Number 106694 by 175mohamed last updated on 06/Aug/20 Answered by bobhans last updated on 06/Aug/20 $$\mathrm{U}_{\mathrm{n}} \:=\:\frac{\mathrm{2n}+\mathrm{1}}{\mathrm{n}\left(\mathrm{n}+\mathrm{1}\right)\left(\mathrm{n}+\mathrm{2}\right)}\:\Rightarrow\:\underset{\mathrm{n}\:=\:\mathrm{1}} {\overset{\mathrm{40}} {\sum}}\:\frac{\mathrm{2n}+\mathrm{1}}{\mathrm{n}\left(\mathrm{n}+\mathrm{1}\right)\left(\mathrm{n}+\mathrm{2}\right)} \\ $$$$\mathrm{decomposition}\:\mathrm{fraction}\: \\ $$$$\frac{\mathrm{2n}+\mathrm{1}}{\mathrm{n}\left(\mathrm{n}+\mathrm{1}\right)\left(\mathrm{n}+\mathrm{2}\right)}\:=\:\frac{\mathrm{A}}{\mathrm{n}}\:+\:\frac{\mathrm{B}}{\mathrm{n}+\mathrm{1}}\:+\:\frac{\mathrm{C}}{\mathrm{n}+\mathrm{2}} \\…
Question Number 172234 by Sotoberry last updated on 24/Jun/22 Commented by cortano1 last updated on 24/Jun/22 $$\:{S}\:=\:\int_{\mathrm{0}} ^{\:\mathrm{2}\pi} \sqrt{\left(\frac{{dx}}{{d}\theta}\right)^{\mathrm{2}} +\left(\frac{{dy}}{{d}\theta}\right)^{\mathrm{2}} }\:{d}\theta \\ $$$$\:\begin{cases}{\frac{{dx}}{{d}\theta}\:=\:−\mathrm{3}{a}\mathrm{cos}\:^{\mathrm{2}} \theta\:\mathrm{sin}\:\theta\:}\\{\frac{{dy}}{{d}\theta}=\:\mathrm{2}{a}\mathrm{sin}\:\theta\:\mathrm{cos}\:\theta}\end{cases} \\…
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Question Number 172213 by ArielVyny last updated on 24/Jun/22 $$ \\ $$stephanwant to count number of objects have in space For a first measurement, they…
Question Number 106653 by Dwaipayan Shikari last updated on 06/Aug/20 $$\mathrm{30}+\mathrm{144}+\mathrm{420}+\mathrm{960}+\mathrm{1890}+\mathrm{3360}+…{n} \\ $$ Commented by Dwaipayan Shikari last updated on 06/Aug/20 $${y}_{\mathrm{0}} \:\:\:\:\:\:\bigtriangleup{y}_{\mathrm{0}} \:\:\:\:\bigtriangleup^{\mathrm{2}} {y}_{\mathrm{0}}…
Question Number 106637 by john santu last updated on 06/Aug/20 $$\:\:\:\:\:\:@\mathrm{JS}@ \\ $$$$\mathrm{The}\:\mathrm{quartic}\:\mathrm{equation}\:\mathrm{x}^{\mathrm{4}} +\mathrm{2x}^{\mathrm{3}} +\mathrm{14x}+\mathrm{15}=\mathrm{0} \\ $$$$\mathrm{has}\:\mathrm{one}\:\mathrm{root}\:\mathrm{equal}\:\mathrm{to}\:\mathrm{1}+\mathrm{2i}\:.\:\mathrm{Find} \\ $$$$\mathrm{the}\:\mathrm{other}\:\mathrm{three}\:\mathrm{roots}.\: \\ $$ Answered by bemath last…