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

  • A
    $2$
  • B
    $1$
  • C
    $\frac{7}{4}$
  • D
    $\frac{3}{2}$

Explore More

Similar Questions

$\cos^2 10^\circ - \cos 10^\circ \cos 50^\circ + \cos^2 50^\circ$ ની કિંમત કોના બરાબર છે:

જો $\sin \alpha = \sin \beta$ અને $\cos \alpha = \cos \beta$ હોય,તો કોઈ પૂર્ણાંક $n$ માટે $\alpha - \beta = $ શું થાય?

જો $\tan \alpha = \frac{x^2 - x}{x^2 - x + 1}$ અને $\tan \beta = \frac{1}{2x^2 - 2x + 1}$ $(x \ne 0, 1)$,જ્યાં $0 < \alpha, \beta < \frac{\pi}{2}$ હોય,તો $\tan(\alpha + \beta)$ ની કિંમત કેટલી થાય?

જો $\cos x = \frac{2 \cos y - 1}{2 - \cos y}$ જ્યાં $x, y \in (0, \pi)$,તો $\tan(x/2) \cot(y/2) =$

જો $0 \leqslant x \leqslant \pi$ અને $81^{\sin ^2 x} + 81^{\cos ^2 x} = 30$ હોય,તો $x$ ની કિંમત શોધો:

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