A projectile is fired at an angle \( \theta \) with the horizontal. Find the condition under whi...

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A projectile is fired at an angle \( \theta \) with the horizontal. Find the condition under which it lands perpendicular on an inclined plane of inclination \( \alpha \) as shown in figure.
(a) \( \sin \alpha=\cos (\theta-\alpha) \)
(b) \( \cos \alpha=\sin (\theta-\alpha) \)
(c) \( \tan \theta=\cot (\theta-\alpha) \)
(d) \( \cot (\theta-\alpha)=2 \tan \alpha \)
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