by delve
Tags: maximum, range
 P: 34 Hey guys, I was hoping somebody might help me; I'm really confused. I obtained the formula for distance, which is this: d=[(2[v_0]^2(cos[alpha])sin([alpha-beta])]/gcos^2(beta) And the derivative for distance, which is this: derivative of d with respect to alpha=0=(2[v_0]^2)/(gcos^2(beta))*(-sin(alpha)sin(alpha-beta)+cos(alpha)cos(alpha-beta))*cos(2alpha-beta) I was trying to see what alpha would be for maximum range, but I have no idea where the very end term on the right comes from: cos(2alpha-beta). Could somebody please me? Thank you. David