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$(\cot \theta + \tan \theta)$ equals :
- (a)$\operatorname{cosec} \theta \sec \theta$
- (b)$\sin \theta \sec \theta$
- (c)$\cos \theta \tan \theta$
- (d)$\sin \theta \cos \theta$
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Sol. (A) $\operatorname{cosec} \theta \sec \theta$