$\theta$ અને $\alpha$ એ $Q_3$ માં છે. જો $\cos (\theta-\alpha), \cos \theta, \cos (\theta+\alpha)$ હાર્મોનિક શ્રેણીમાં હોય,તો $\cos \theta \sec \frac{\alpha}{2} = $

  • A
    $-\sqrt{2}$
  • B
    $\sqrt{2}$
  • C
    $-\sqrt{3}$
  • D
    $\sqrt{3}$

Explore More

Similar Questions

$\cos ^4 \frac{\pi}{12} + \cos ^4 \frac{5 \pi}{12} + \cos ^4 \frac{7 \pi}{12} + \cos ^4 \frac{11 \pi}{12} = $

જો $\cos 2B = \frac{\cos(A+C)}{\cos(A-C)}$ હોય,તો $\tan A, \tan B, \tan C$ એ

જો $\tan \theta = \frac{x \sin \phi}{1 - x \cos \phi}$ અને $\tan \phi = \frac{y \sin \theta}{1 - y \cos \theta}$ હોય,તો $\frac{x}{y} = $

Difficult
View Solution

$\frac{1-\cos(2x)+\sin(x)}{\sin(2x)+\cos(x)} = $

જો $|\sin \alpha - \cos \alpha| = \frac{3}{4}$ હોય,તો $|\sec 2\alpha - \tan 2\alpha| = $

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