Solve this following

Question:

Mark $(\sqrt{ })$ against the correct answer in the following:

If $\mathrm{x}=\mathrm{a} \sec \theta, \mathrm{y}=\mathrm{b} \tan \theta$ then $\frac{\mathrm{dy}}{\mathrm{dx}}=$ ?

A. $\frac{b}{a} \sec \theta$

B. $\frac{b}{a} \operatorname{cosec} \theta$

C. $\frac{b}{a} \cot \theta$

D. none of these

Solution:

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