A particle is thrown over a triangle fro...

A particle is thrown over a triangle from one end of a horizontal base and after grazing the vertex falls on the other end of the base. If `alpha and beta` be the base angles and `theta` the angle of projection, prove that `tan theta = tan alpha + tan beta` .

`tan alpha+tan beta`

`sin alpha+sin beta`

`tan alpha+sin beta`

`cos alpha+cos alpha`

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