int_{-pi}^pi frac{cos ^{2022} x}{1+(2022)^x} | vedclass

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Question

(A) ધારો કે $I = \int_{-\pi}^\pi \frac{\cos ^{2022} x}{1+(2022)^x} d x$  ...$(i)$ગુણધર્મ $\int_a^b f(x) d x = \int_a^b f(a+b-x) d x$ નો ઉપયોગ કરતા,આપણ

Vedclass · Accepted Answer

$\frac{2022 !}{2^{2022}((1011) !)^2} \pi$

Vedclass · Answer

(A) ધારો કે $I = \int_{-\pi}^\pi \frac{\cos ^{2022} x}{1+(2022)^x} d x$  ...$(i)$ગુણધર્મ $\int_a^b f(x) d x = \int_a^b f(a+b-x) d x$ નો ઉપયોગ કરતા,આપણને મળે છે:$I = \int_{-\pi}^\pi \frac{\cos ^{2022}(-x)}{1+(2022)^{-x}} d x = \int_{-\pi}^\pi \frac{\cos ^{2022} x}{1+\frac{1}{(2022)^x}} d x = \int_{-\pi}^\pi \frac{(2022)^x \cos ^{2022} x}{(2022)^x+1} d x$  ...(ii)$(i)$ અને (ii) નો સરવાળો કરતા:$2I = \int_{-\pi}^\pi \frac{\cos ^{2022} x (1+(2022)^x)}{1+(2022)^x} d x = \int_{-\pi}^\pi \cos ^{2022} x d x$કારણ કે $\cos ^{2022} x$ એ યુગ્મ વિધેય છે,$2I = 2 \int_0^\pi \cos ^{2022} x d x$,તેથી $I = \int_0^\pi \cos ^{2022} x d x = 2 \int_0^{\pi/2} \cos ^{2022} x d x$.વોલિસના સૂત્ર $\int_0^{\pi/2} \cos^n x d x = \frac{(n-1)!!}{n!!} \cdot \frac{\pi}{2}$ (જ્યાં $n$ યુગ્મ છે) નો ઉપયોગ કરતા:$I = 2 \cdot \frac{2021!!}{2022!!} \cdot \frac{\pi}{2} = \frac{2021!!}{2022!!} \pi = \frac{2021!! \cdot 2022!!}{(2022!!)^2} \pi = \frac{2022!}{(2^{1011} \cdot 1011!)^2} \pi = \frac{2022!}{2^{2022} (1011!)^2} \pi$.

$\int_{-\pi}^\pi \frac{\cos ^{2022} x}{1+(2022)^x} d x=$

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