so a force of [LaTeX ERROR: Convert failed] is required to move it up this hill at a constant velocity.

so all the forces must be balanced.

Make sure you understand how the friction force is directed. It is down the plane because friction opposed the direction of motion (which is up the plane in this case).

So the forces going down the plane are the masses weight and the friction force.

so we have [LaTeX ERROR: Convert failed]

use exact values for sine and cosine and solve for