Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
Easy$\cos 1^\circ \cdot \cos 2^\circ \cdot \cos 3^\circ \cdot \dots \cdot \cos 179^\circ = $
- A$0$
- B$1$
- C$2$
- D$\frac{1}{2}$
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Easy
View Solution$(\sin \theta + \cos \theta)(\tan \theta + \cot \theta)$ is equal to
$\cos 18^{\circ} = $
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