int_0^pi x cdot sin^5 x cdot cos^6 x , dx = | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Let $I = \int_0^\pi x \sin^5 x \cos^6 x \, dx$. Using the property $\int_0^a f(x) \, dx = \int_0^a f(a-x) \, dx$,we get: $I = \int_0^\pi (\pi - x)

Vedclass · Accepted Answer

$\frac{8 \pi}{693}$

Vedclass · Answer

(B) Let $I = \int_0^\pi x \sin^5 x \cos^6 x \, dx$. Using the property $\int_0^a f(x) \, dx = \int_0^a f(a-x) \, dx$,we get: $I = \int_0^\pi (\pi - x) \sin^5(\pi - x) \cos^6(\pi - x) \, dx$ Since $\sin(\pi - x) = \sin x$ and $\cos(\pi - x) = -\cos x$,we have: $I = \int_0^\pi (\pi - x) \sin^5 x (-\cos x)^6 \, dx = \int_0^\pi (\pi - x) \sin^5 x \cos^6 x \, dx$ $I = \pi \int_0^\pi \sin^5 x \cos^6 x \, dx - I$ $2I = \pi \int_0^\pi \sin^5 x \cos^6 x \, dx$ Since $\sin^5 x \cos^6 x$ is symmetric about $x = \pi/2$,$\int_0^\pi \sin^5 x \cos^6 x \, dx = 2 \int_0^{\pi/2} \sin^5 x \cos^6 x \, dx$. Using Wallis' formula $\int_0^{\pi/2} \sin^m x \cos^n x \, dx = \frac{(m-1)!!(n-1)!!}{(m+n)!!}$: $\int_0^{\pi/2} \sin^5 x \cos^6 x \, dx = \frac{(4 \cdot 2) \cdot (5 \cdot 3 \cdot 1)}{11 \cdot 9 \cdot 7 \cdot 5 \cdot 3 \cdot 1} = \frac{8 \cdot 15}{11 \cdot 9 \cdot 7 \cdot 15} = \frac{8}{693}$. Thus,$2I = \pi \cdot 2 \cdot \frac{8}{693} = \frac{16\pi}{693}$. $I = \frac{8\pi}{693}$.

$\int_0^\pi x \cdot \sin^5 x \cdot \cos^6 x \, dx =$

Similar Questions

If $f(x) = \int_0^{\pi/2} \frac{\ln(1 + x \sin^2 \theta)}{\sin^2 \theta} d\theta$,$x \geq 0$,then:

If $f(x) = \int_{\pi^2/16}^{x^2} \frac{\sin x \cdot \sin \sqrt{\theta}}{1 + \cos^2 \sqrt{\theta}} \, d\theta$,then the value of $f'(\frac{\pi}{2})$ is:

$\int_0^a x(2ax - x^2)^{3/2} dx = $

If $\int_{\sin x}^1 {{t^2}f(t)\;dt = 1 - \sin x} $,$x \in \left( {0,\frac{\pi }{2}} \right)$,then $f\left( {\frac{1}{{\sqrt 3 }}} \right)$ is equal to:

The value of $\lim _{x \rightarrow 0} \frac{\int_{0}^{x^{2}} \cos \left(t^{2}\right) d t}{x \sin x}$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module