Complete the following using C language

Using the formulae below, write a programme that converts longitude() and latitude() into x, y and z co-ordinates:

x = Dcos()cos()

y = Dsin()cos()

z = Dsin()

Let D = 6400km (Earths radius - rounded).

Your programme needs to check your values are in the following range:

-90 90, -180 360