यदि $\sin (\theta + \alpha ) = a$ और $\sin (\theta + \beta ) = b$ है,तो $\cos 2(\alpha - \beta ) - 4ab\cos (\alpha - \beta )$ का मान ज्ञात कीजिए।

  • A
    $1 - a^2 - b^2$
  • B
    $1 - 2a^2 - 2b^2$
  • C
    $2 + a^2 + b^2$
  • D
    $2 - a^2 - b^2$

Explore More

Similar Questions

यदि $\tan A = 2\tan B + \cot B$ है,तो $2\tan (A - B) = $

यदि $\sin \theta_1 + \sin \theta_2 + \sin \theta_3 = 3$ है,तो $\cos \theta_1 + \cos \theta_2 + \cos \theta_3 = $

यदि $\sin \theta = \frac{12}{13}$ जहाँ $0 < \theta < \frac{\pi}{2}$ और $\cos \phi = -\frac{3}{5}$ जहाँ $\pi < \phi < \frac{3\pi}{2}$ है,तो $\sin(\theta + \phi)$ का मान ज्ञात कीजिए।

$\frac{{\sin 3A - \cos \left( {\frac{\pi }{2} - A} \right)}}{{\cos A + \cos (\pi + 3A)}} = $

$\frac{\cot 54^\circ}{\tan 36^\circ} + \frac{\tan 20^\circ}{\cot 70^\circ}$ का मान है

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