If \( R \) is the range for an angle of projection of \( 15^{\circ}...

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If \( R \) is the range for an angle of projection of \( 15^{\circ} \) with the horizontal, then the other angle of projection for which the range is \( R \), is
\( \mathrm{P} \)
(A) \( 75^{\circ} \)
(B) \( 60^{\circ} \)
(C) \( 45^{\circ} \)
(D) \( 30^{\circ} \).
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