Solve this following

Question:

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

If $\mathrm{x}=\mathrm{a} \cos ^{2} \theta, \mathrm{y}=\mathrm{b} \sin ^{2} \theta$ then $\frac{\mathrm{dy}}{\mathrm{dx}}=$ ?

A. $\frac{-a}{b}$

B. $\frac{-\mathrm{a}}{\mathrm{b}} \cot \theta$

C. $\frac{-b}{a}$

D. none of these

Solution:

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