The Area of a rectangle can be given in terms of the length p of a diagonal and two trigonometric functions of an angle formed by the diagnoal and a side.Which of the following formulas gives the area A of this rectangle and why?

A. p^2 sec(O)

B. p^2 cot(O)

C. p^2 sin(O) tan(O)

D. p^2 sin(O) cos(O)