int frac{dx}{7+5 cos x} is equal to | vedclass

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

Question

(B) Let $I = \int \frac{dx}{7+5 \cos x}$.Using the identity $\cos x = \cos^2 \frac{x}{2} - \sin^2 \frac{x}{2}$ and $1 = \cos^2 \frac{x}{2} + \sin^2 \f

Vedclass · Accepted Answer

$\frac{1}{\sqrt{6}} 	an ^{-1}\left(\frac{1}{\sqrt{6}} 	an \frac{x}{2}ight)+c$

Vedclass · Answer

(B) Let $I = \int \frac{dx}{7+5 \cos x}$.Using the identity $\cos x = \cos^2 \frac{x}{2} - \sin^2 \frac{x}{2}$ and $1 = \cos^2 \frac{x}{2} + \sin^2 \frac{x}{2}$,we get:$I = \int \frac{dx}{7(\cos^2 \frac{x}{2} + \sin^2 \frac{x}{2}) + 5(\cos^2 \frac{x}{2} - \sin^2 \frac{x}{2})}$$I = \int \frac{dx}{12 \cos^2 \frac{x}{2} + 2 \sin^2 \frac{x}{2}}$Divide numerator and denominator by $\cos^2 \frac{x}{2}$:$I = \int \frac{\sec^2 \frac{x}{2} dx}{12 + 2 	an^2 \frac{x}{2}} = \frac{1}{2} \int \frac{\sec^2 \frac{x}{2} dx}{6 + 	an^2 \frac{x}{2}}$Let $	an \frac{x}{2} = z$,then $\frac{1}{2} \sec^2 \frac{x}{2} dx = dz$.$I = \int \frac{dz}{6 + z^2} = \int \frac{dz}{(\sqrt{6})^2 + z^2}$Using the formula $\int \frac{dx}{a^2 + x^2} = \frac{1}{a} 	an^{-1} \frac{x}{a} + c$:$I = \frac{1}{\sqrt{6}} 	an^{-1} \frac{z}{\sqrt{6}} + c = \frac{1}{\sqrt{6}} 	an^{-1} \left(\frac{1}{\sqrt{6}} 	an \frac{x}{2}ight) + c$.

$\int \frac{dx}{7+5 \cos x}$ is equal to

Similar Questions

Let $\tan^0 x = 1$. If $\int \left( \sum_{k=0}^7 \tan^k x \right) dx = \sum_{k=1}^7 A_k \tan^k x + C$, then $\sum_{k=1}^7 A_k$ is equal to

Let $\alpha \in (0, \frac{\pi}{2})$ be fixed. If the integral $\int \frac{\tan x+\tan \alpha}{\tan x-\tan \alpha} dx = A(x) \cos 2\alpha + B(x) \sin 2\alpha + c$ (where $c$ is a constant of integration),then functions $A(x)$ and $B(x)$ are respectively

Integrate the function: $\frac{1}{\sqrt{9x^{2}+6x+5}}$

If $f(x) = \int \operatorname{cosec}^5 x \, dx$,then $f\left(\frac{\pi}{4}\right) = $

If $\int \frac{\sin x \cos x}{\sqrt{\cos^4 x - \sin^4 x}} dx = -\frac{f(x)}{2} + c$,then the domain of $f(x)$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module