A stone projected with a velocity u at an angle $\text{θ}$ with the horizontal reaches maximum height ${\text{H}}_1$ . When it is projected with velocity u at an angle $\left(\frac{\pi }{2}-\theta \right)$ with the horizontal reaches maximum height ${\text{H}}_2$ . The relation between horizontal range, R of the projectile, ${\text{H}}_1$ and ${\text{H}}_2$ is