A projectile is fired at angle \( \theta \) with the horizontal. \( \mathrm{P} \) Find the condi...

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A projectile is fired at angle \( \theta \) with the horizontal.
\( \mathrm{P} \) Find the condition under which it lands perpendicular

W on an inclined plane inclination \( \alpha \) as shown in figure.
(1) \( \sin \alpha=\cos (\theta-\alpha) \)
(2) \( \cos \alpha=\sin (\theta-\alpha) \)
(3) \( \tan \theta=\cot (\theta-\alpha) \)
(4) \( \cot (\theta-\alpha)=2 \tan \alpha \)
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