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Two particles projected form the same point with same speed u at angles of projection `alpha and beta` strike the horizontal ground at the same point. If `h_1 and h_2` are the maximum heights attained by the projectile, R is the range for both and `t_1 and t_2` are their times of flights, respectively, then

A

`alpha+beta=(pi//2)`

B

`R=4sqrt(h_(1),h_(2))`

C

`(t_(1))/(t_(2))=tan alpha`

D

`tan alpha=sqrt((h_(1)//h_(2))

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