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Which of the following statements is true ?
- (a)$\sin 20^\circ > \sin 70^\circ$
- (b)$\sin 20^\circ > \cos 20^\circ$
- (c)$\cos 20^\circ > \cos 70^\circ$
- (d)$\tan 20^\circ > \tan 70^\circ$
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(c) $\cos 20^\circ > \cos 70^\circ$