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sec$\theta$ when expressed in terms of cot $\theta$, is equal to :
- (a)$\frac{1+\cot^2\theta}{\cot \theta}$
- (b)$\sqrt{1+\cot^2\theta}$
- (c)$\frac{\sqrt{1+\cot^2\theta}}{\cot \theta}$
- (d)$\frac{\sqrt{1-\cot^2\theta}}{\cot \theta}$
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Sol. (c) $\frac{\sqrt{1 + \cot^2 \theta}}{\cot \theta}$