Question 20If $\tan\alpha$ and $\tan\beta$ are the roots of $x^2-px+q=0,$ and $\cot\alpha$ and $\cot\beta$ are the roots of $x^2-rx+s=0,$ then $rs$ is necessarily$pq$$\frac1{pq}$$\frac{p}{q^2}$$\frac{q}{p^2}$$\frac pq$