If $\cos \alpha + \cos \beta = a$ and $\sin \alpha + \sin \beta = b$,then match the items given in List-$A$ with those of their values in List-$B$.
List-$A$List-$B$
$(I)$ $\tan \left(\frac{\alpha + \beta}{2}\right) =$$(a)$ $\frac{b}{a}$
$(II)$ $\cos (\alpha + \beta) =$$(b)$ $\frac{2ab}{a^2 + b^2}$
$(III)$ $\sin (\alpha + \beta) =$$(c)$ $\frac{2ab}{a^2 - b^2}$
$(IV)$ $\tan (\alpha + \beta) =$$(d)$ $\frac{a^2 - b^2}{a^2 + b^2}$

  • A
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (e), (III)$ $\rightarrow (d), (IV)$ $\rightarrow (c)$
  • B
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (c), (III)$ $\rightarrow (b), (IV)$ $\rightarrow (e)$
  • C
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (d), (III)$ $\rightarrow (c), (IV)$ $\rightarrow (b)$
  • D
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (d), (III)$ $\rightarrow (b), (IV)$ $\rightarrow (c)$

Explore More

Similar Questions

If $\tan^2 \alpha \tan^2 \beta + \tan^2 \beta \tan^2 \gamma + \tan^2 \gamma \tan^2 \alpha + 2\tan^2 \alpha \tan^2 \beta \tan^2 \gamma = 1$,then the value of $\sin^2 \alpha + \sin^2 \beta + \sin^2 \gamma$ is

Difficult
View Solution

If $\sin x + \operatorname{cosec} x = 3$,then the value of $\sin^{4} x + \operatorname{cosec}^{4} x$ is

The value of $\left( 1 + \cos \frac{\pi }{9} \right) \left( 1 + \cos \frac{3\pi }{9} \right) \left( 1 + \cos \frac{5\pi }{9} \right) \left( 1 + \cos \frac{7\pi }{9} \right)$ is

Difficult
View Solution

The graph of the function $f(x) = \cos x \cos(x + 2) - \cos^2(x + 1)$ is:

Difficult
View Solution

$\sin ^2 76^{\circ}+\sin ^2 16^{\circ}-\sin 76^{\circ} \sin 16^{\circ} = $

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo