Finding the angle that maximizes the projectile's range?

The range of a projectile is R=(vsin(2theta))/g v is initial velocity g is acceleration due to gravity and is constant theta is the firing angle This is in the section of optimization for calculus which means i need another equation besides the one given, but I don't know what the other equation would... show more The range of a projectile is R=(vsin(2theta))/g
v is initial velocity
g is acceleration due to gravity and is constant
theta is the firing angle

This is in the section of optimization for calculus which means i need another equation besides the one given, but I don't know what the other equation would be.

And just saying maximizing sin(2theta) won't work, it needs to be an equation.

Thanks!
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