Class 11MathematicsTrigonometric FunctionsFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
EasyWhich of the following is not correct?
- A$\cos 5 \pi = \cos 4 \pi$
- B$\sin 2 \pi = \sin (-2 \pi)$
- C$\sin 4 \pi = \sin 6 \pi$
- D$\tan 45^{\circ} = \tan (-315^{\circ})$
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Similar Questions
The points $(\cos \alpha, \sin \alpha)$ and $(\cos (\pi+\alpha), \sin (\pi+\alpha))$ for $\alpha \in R$ have directions:
Medium
View Solution$\sin ^4 \frac{\pi}{8} + \cos ^4 \frac{3 \pi}{8} - \sin ^4 \frac{3 \pi}{8} + \sin ^4 \frac{5 \pi}{8} + \cos ^4 \frac{7 \pi}{8} - \sin ^4 \frac{7 \pi}{8} = ?$
Which of the following trigonometric values are negative?
$I. \sin(-292^{\circ})$
$II. \tan(-190^{\circ})$
$III. \cos(-207^{\circ})$
$IV. \cot(-222^{\circ})$
$I. \sin(-292^{\circ})$
$II. \tan(-190^{\circ})$
$III. \cos(-207^{\circ})$
$IV. \cot(-222^{\circ})$
$\sin ^{2} 17.5^{\circ} + \sin ^{2} 72.5^{\circ}$ is equal to
Find the values of the other five trigonometric functions if $\cot x = \frac{3}{4}$ and $x$ lies in the third quadrant.
Easy
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