For the following two (02) items:
Let sin A + sin B = p and cos A + cos B = q

What is p/q equal to?

For the following two (02) items:
Let sin A + sin B = p and cos A + cos B = q

What is $\frac{p^{2}-q^{2}}{p^{2}+q^{2}}$ equal to?

For the following two (02) items:
Let p = cosec 20° and q = cosec 70°.

What is $(\frac{\sqrt{3}p}{4}-\frac{q}{4})$ equal to?

For the following two (02) items:
Let p = cosec 20° and q = cosec 70°.

What is $\frac{p^{2}+q^{2}}{p^{2}q^{2}}$ equal to?