For angles theta and (90 - theta):

• R(theta) = $u^2$*sin$\frac{2*theta}{g}$
• R(90-theta) = $u^2$sin(2(90-theta))/g = $u^2$*sin$\frac{180-2*theta}{g}$ = $u^2$*sin$\frac{2*theta}{g}$

Therefore R(theta) = R(90-theta).

But heights differ:

• H(theta) = $u^2$*sin^2$$\frac{theta}{(2g)}
• H(90-theta) = $u^2$*cos^2$$\frac{theta}{(2g)}
• Ratio: H$\frac{theta}{H}$(90-theta) = $tan^2$(theta)

And flight times differ:

• T(theta) = 2u*sin$\frac{theta}{g}$
• T(90-theta) = 2u*cos$\frac{theta}{g}$
• Ratio: T$\frac{theta}{T}$(90-theta) = tan(theta)

JEE favorite: RH relationship: R = 4H*cot(theta)