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[" 9.A projectile is fired at an angle "theta" with the horizontal.Find the condition under which it lands "],[" perpendicular on an inclined plane inclination "alpha" as shown in figure."],[qquad (1)/(2x)],[[" (A) "sin alpha=cos(theta-alpha)," (B) "cos alpha=sin(theta-alpha)],[" (C) "tan theta=cot(theta-alpha)," (D) "cot(theta-alpha)=2tan alpha]]

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