If $$p = \cos ec\theta - \cot \theta $$ and $$q = {(\cos ec\theta + \cot \theta )^{ - 1}}$$, then which one of the following is correct?

Consider the following for the three (03) items that follow: Let $p=\sin 35{}^{\circ }$, $q=\sin 25{}^{\circ }$ and $r=\sin (-95{}^{\circ })$. 

What is $(p+q+r)$ equal to?

Consider the following for the three (03) items that follow: Let $p=\sin 35{}^{\circ }$, $q=\sin 25{}^{\circ }$ and $r=\sin (-95{}^{\circ })$. 

What is $(pq+qr+rp)$ equal to?

Consider the following for the three (03) items that follow: Let $p=\sin 35{}^{\circ }$, $q=\sin 25{}^{\circ }$ and $r=\sin (-95{}^{\circ })$. 

What is (p²+q²+r²) equal to?