What is the equation for the measure of angle p?

There is a theorem for inscribed quadrilaterals in a circle. This theorem states that: "Opposite angles in any quadrilateral inscribed in a circle are supplements of each other".
In other words, the sum of each two opposite angles in a quadrilateral inscribed in a circle is 180.

Based on the above:
measure angle O + measure angle Q = 180
measure angle R + measure angle P = 189

Therefore:
measure angle P = 180 - measure angle R

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)

The density of the cube is 40