Angle = 0.2792526803190927 rad (slider from 0 to 90*°, step 0.017453292519943295)
f(x) = (-9.81) / (2 * (40 * cos(Angle))^(2)) * x^(2) + tan(Angle) * x + 0.35
A, B = Intersect(f, xAxis)