If tan B = frac{n sin A cos A}{1 - n cos^2 A} | vedclass

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

Question

(A) We know that $	an(A + B) = \frac{	an A + 	an B}{1 - 	an A 	an B}$.Substituting $	an B = \frac{n \sin A \cos A}{1 - n \cos^2 A}$:$	an(A + B)

Vedclass · Accepted Answer

$\frac{\sin A}{(1 - n) \cos A}$

Vedclass · Answer

(A) We know that $	an(A + B) = \frac{	an A + 	an B}{1 - 	an A 	an B}$.Substituting $	an B = \frac{n \sin A \cos A}{1 - n \cos^2 A}$:$	an(A + B) = \frac{	an A + \frac{n \sin A \cos A}{1 - n \cos^2 A}}{1 - 	an A \cdot \frac{n \sin A \cos A}{1 - n \cos^2 A}}$$= \frac{\frac{\sin A}{\cos A} + \frac{n \sin A \cos A}{1 - n \cos^2 A}}{1 - \frac{\sin A}{\cos A} \cdot \frac{n \sin A \cos A}{1 - n \cos^2 A}}$$= \frac{\sin A(1 - n \cos^2 A) + n \sin A \cos^2 A}{\cos A(1 - n \cos^2 A) - n \sin^2 A \cos A}$$= \frac{\sin A - n \sin A \cos^2 A + n \sin A \cos^2 A}{\cos A(1 - n(\cos^2 A + \sin^2 A))}$$= \frac{\sin A}{\cos A(1 - n(1))}$$= \frac{\sin A}{(1 - n) \cos A}$.

List-$I$	List-$II$
$(I)$ $\sin^2 5^{\circ} + \sin^2 10^{\circ} + \sin^2 15^{\circ} + \dots + \sin^2 90^{\circ}$	$(A)$ $0$
$(II)$ $\tan^2 5^{\circ} \cdot \tan^2 10^{\circ} \cdot \tan^2 15^{\circ} \dots \tan^2 85^{\circ}$	$(B)$ $\frac{19}{2}$
$(III)$ $\cos^2 5^{\circ} + \cos^2 10^{\circ} + \cos^2 15^{\circ} + \dots + \cos^2 180^{\circ}$	$(C)$ $18$
$(IV)$ $\cot 5^{\circ} + \cot 10^{\circ} + \cot 15^{\circ} + \dots + \cot 175^{\circ}$	$(D)$ $1$
	$(E)$ $-1$

If $\tan B = \frac{n \sin A \cos A}{1 - n \cos^2 A}$,then $\tan(A + B)$ equals

Similar Questions

The value of $\cos^2 10^\circ - \cos 10^\circ \cos 50^\circ + \cos^2 50^\circ$ is equal to:

The number of $x \in [0, 2\pi]$ for which $|\sqrt{2 \sin^4 x + 18 \cos^2 x} - \sqrt{2 \cos^4 x + 18 \sin^2 x}| = 1$ is

If $P = \tan 15^{\circ} + \cot 15^{\circ}$,$Q = \tan 22 \frac{1}{2}^{\circ} + \cot 22 \frac{1}{2}^{\circ}$ and $R = \sin 54^{\circ} + \sin 18^{\circ}$,then their ascending order is

The value of the expression $1 - \frac{\sin^2 y}{1 + \cos y} + \frac{1 + \cos y}{\sin y} - \frac{\sin y}{1 - \cos y}$ is equal to

Vedclass Test Series

Exam Paper Generator

Online Exam Module