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A projectile is projected from top of tower with velocity 20 m/s and angle alpha with horizontal. After 10s the inclination of velocity with horizontal becomes beta. Then the value of `tan(alpha) - tan(beta)` (`g = 10 m/s^2`)

A

`5 cos(alpha)`

B

`5 sec(alpha)`

C

`6 sin(alpha)`

D

`4 cot(alpha)`

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