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If-j-1-a-jb-where-a-b-are-real-express-b-in-terms-of-Answer-2-2-2-1-

Question Number 51571 by Tawa1 last updated on 28/Dec/18 $$\mathrm{If}\:\:\:\alpha\:−\:\mathrm{j}\beta\:\:=\:\:\frac{\mathrm{1}}{\mathrm{a}\:−\:\mathrm{jb}}\:\:,\:\:\:\:\:\:\mathrm{where}\:\:\:\alpha,\:\beta,\:\mathrm{a},\:\mathrm{b}\:\:\mathrm{are}\:\mathrm{real},\:\mathrm{express}\:\:\mathrm{b}\:\:\mathrm{in}\:\mathrm{terms} \\ $$$$\mathrm{of}\:\:\alpha,\:\beta\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\mathrm{Answer}:\:\:\:\:\:\:\:\:\:\:\frac{−\:\beta}{\alpha^{\mathrm{2}} \:+\:\beta^{\mathrm{2}} \:−\:\mathrm{2}\alpha\:+\:\mathrm{1}} \\ $$ Answered by tanmay.chaudhury50@gmail.com last updated on 28/Dec/18 $${a}−{ib}=\frac{\mathrm{1}}{\alpha−{i}\beta} \\…

k-1-1-k-1-sin-k-k-

Question Number 116965 by Dwaipayan Shikari last updated on 08/Oct/20 $$\underset{{k}=\mathrm{1}} {\overset{\infty} {\sum}}\left(−\mathrm{1}\right)^{{k}+\mathrm{1}} \:\frac{{sin}\left({k}\theta\right)}{{k}\theta} \\ $$ Answered by Bird last updated on 08/Oct/20 $${let}\:{g}\left({u}\right)\:=\sum_{{k}=\mathrm{1}} ^{\infty}…

e-3x-1-e-x-dx-

Question Number 51420 by Tawa1 last updated on 26/Dec/18 $$\int\:\:\frac{\mathrm{e}^{\mathrm{3x}} }{\mathrm{1}\:+\:\mathrm{e}^{\mathrm{x}} }\:\mathrm{dx} \\ $$ Answered by ajfour last updated on 26/Dec/18 $${let}\:\:\mathrm{1}+{e}^{{x}} \:=\:{t}\:\:\:,\:\Rightarrow\:\:{e}^{{x}} {dx}\:=\:{dt} \\…