I need help integrating this

(dVp/dt)=Fin-Fout-(k Ap sin ((t/D))

Quantities:

-Fin is the flow of water in the inlet stream, in units of m3/hour.

-Fout is the flow of water in the outlet stream, with the same units.

-E is the rate of water evaporation from the pond, in units of m3/hour.

-Vp is the volume of water in the pond in units of m3 . Pond has a radius r and a depth h

-Vi=initial Volume

-E(t)=E(t) = k Ap sin ((t/D)

where D is the number of daylights hours, Ap is the surface area of the pond, and k is a constant