Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
EasyThe value of $\cos 15^\circ - \sin 15^\circ$ is equal to
- A$\frac{1}{\sqrt{2}}$
- B$\frac{1}{2}$
- C$-\frac{1}{\sqrt{2}}$
- D$0$
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Similar Questions
The value of $\frac{3 + \cot 76^{\circ} \cot 16^{\circ}}{\cot 76^{\circ} + \cot 16^{\circ}}$ is:
Evaluate: $\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma )$
Easy
View Solution$\cos(36^{\circ}-A) \cos(36^{\circ}+A) + \cos(54^{\circ}+A) \cos(54^{\circ}-A) = $
If $\cos \theta = \frac{8}{17}$ and $\theta$ lies in the $1^{st}$ quadrant,then the value of $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ is
Medium
View SolutionIf $\sin \theta = \frac{-12}{13}$,$\cos \phi = \frac{-4}{5}$ and $\theta, \phi$ lie in the third quadrant,then $\tan(\theta - \phi) =$
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