Answer:
Here \[R=nH\] or \[\frac{{{u}^{2}}\sin 2\theta }{g}=n.\frac{{{u}^{2}}{{\sin }^{2}}\theta }{2g}\] or \[\frac{{{\upsilon }^{2}}\times 2\sin \theta \cos \theta }{g}=n.\frac{{{u}^{2}}{{\sin }^{2}}\theta }{2g}\]\[or\tan \theta =\frac{4}{n}\] \[\Rightarrow \] \[\theta ={{\tan }^{-1}}\left( \frac{4}{n} \right)\]
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