Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
EasyIf $2\cos^2 \theta - 2\sin^2 \theta = 1$,then $\theta = \dots ^\circ$.
- A$15$
- B$30$
- C$45$
- D$60$
Explore More
Similar Questions
$\frac{\cot ^2 15^{\circ}-1}{\cot ^2 15^{\circ}+1} = $
If $\cos^3 \theta + \cos^3 \left(\frac{2 \pi}{3} + \theta\right) + \cos^3 \left(\frac{4 \pi}{3} + \theta\right) = \alpha \cos 3 \theta$,then $\alpha$ is equal to
DifficultTS EAMCET 2016
View SolutionThe value of $\tan \left(\frac{\pi}{8}\right)$ is
Find the value of $\tan \frac{\pi}{8}$.
Medium
View SolutionIf $\cos A = \frac{3}{4}$,then $32 \sin \left(\frac{A}{2}\right) \sin \left(\frac{5A}{2}\right) = $
DifficultAP EAMCET 2011
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo