An object is propelled upward at an angle theta, 45 degree < theta <90 degree, to the horizontal with an initial velocity of v0 feet per second from the base of an inclined plane that makes an angle of 45 degree with the horizontal. If air is ignored, the distance R that it travels up the inclined plane is given by:

R= v0square square root of 2/16 multiplied by [cos(theta)(sin(theta)-cos(theta)]....Show R(THETA)

i really dont know how to solve this....this is really advanced and i need help with this