A baseball hit at an angle θ above the horizontal and with initial velocityv0has range R given by R = ((velocity^2) / g))(sin 2θ) ,where0 ≤ θ ≤ π/2 . What angle gives the maximum range? What is the maximum range?

I haven't come across a problem like this, but using what I already know, I'm thinking the angle that gives the maximum range would be π/3. I'm not really sure how to answer the question though. Any advice?