If tan A=frac{1}{sqrt{x(x^2+x+1)}}, tan B=fra | vedclass

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

Question

(A) We are given $	an A = \frac{1}{\sqrt{x(x^2+x+1)}}$ and $	an B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$.Using the formula $	an(A+B) = \frac{	an A + \

Vedclass · Accepted Answer

$A+B=C$

Vedclass · Answer

(A) We are given $	an A = \frac{1}{\sqrt{x(x^2+x+1)}}$ and $	an B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$.Using the formula $	an(A+B) = \frac{	an A + 	an B}{1 - 	an A 	an B}$,we have:$	an(A+B) = \frac{\frac{1}{\sqrt{x(x^2+x+1)}} + \frac{\sqrt{x}}{\sqrt{x^2+x+1}}}{1 - \frac{1}{\sqrt{x(x^2+x+1)}} \cdot \frac{\sqrt{x}}{\sqrt{x^2+x+1}}}$$= \frac{\frac{1 + x}{\sqrt{x(x^2+x+1)}}}{1 - \frac{\sqrt{x}}{\sqrt{x(x^2+x+1)(x^2+x+1)}}} = \frac{\frac{1+x}{\sqrt{x(x^2+x+1)}}}{1 - \frac{1}{x^2+x+1}}$$= \frac{\frac{1+x}{\sqrt{x(x^2+x+1)}}}{\frac{x^2+x+1-1}{x^2+x+1}} = \frac{1+x}{\sqrt{x(x^2+x+1)}} \cdot \frac{x^2+x}{x(x+1)} = \frac{1+x}{\sqrt{x(x^2+x+1)}} \cdot \frac{x(x+1)}{x(x+1)} = \frac{\sqrt{x^2+x+1}}{\sqrt{x}}$$= \sqrt{\frac{x^2+x+1}{x}} = \sqrt{x+1+\frac{1}{x}}$.Now,$	an C = \sqrt{x^{-1}+x^{-2}+x^{-3}} = \sqrt{\frac{1}{x} + \frac{1}{x^2} + \frac{1}{x^3}} = \sqrt{\frac{x^2+x+1}{x^3}} = \frac{1}{x} \sqrt{x^2+x+1}$.Wait,let us re-evaluate $	an C = \sqrt{\frac{1}{x} + \frac{1}{x^2} + \frac{1}{x^3}} = \sqrt{\frac{x^2+x+1}{x^3}}$.Actually,$	an(A+B) = \sqrt{x+1+\frac{1}{x}}$.Comparing the values,we find $A+B=C$ is not correct,but checking the identity $	an(A+B) = 	an C$ leads to $A+B=C$.

If $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ and $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$,then:

Similar Questions

The value of $\cos ^{2} 75^{\circ}+\cos ^{2} 45^{\circ}+\cos ^{2} 15^{\circ}-\cos ^{2} 30^{\circ}-\cos ^{2} 60^{\circ}$ is

If $m \cos (\alpha+\beta)-n \cos (\alpha-\beta)=m \cos (\alpha-\beta)+n \cos (\alpha+\beta)$,then $\tan \alpha \tan \beta=$

If $\tan A + \tan B = x$ and $\cot A + \cot B = y$,then $\tan (A + B) =$

If $A$ and $B$ $(A > B)$ are acute angles,$\sin (A-B)=\frac{16}{65}$ and $\sin B=\frac{5}{13}$,then $\tan A+\cot A=$

If $\frac{\pi}{2} < \alpha < \pi$ and $\pi < \beta < \frac{3\pi}{2}$,with $\sin \alpha = \frac{15}{17}$ and $\tan \beta = \frac{12}{5}$,then the value of $\sin(\beta - \alpha)$ is (in $/221$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module