The equation of trajectory for point ' \(P\) 'can be written as :
\(y=x \tan \theta\left(1-\frac{x}{R}\right)=x_1 \tan \theta\left(1-\frac{x_1}{x_1+x_2}\right)=x_1 \tan \theta\left(\frac{x_1+x_2-x_1}{x_1+x_2}\right)\)
\(y=\frac{x_1 x_2}{x_1+x_2} \tan \theta\)
$\left(g=10\,m / s ^2\right)$