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If a(1),a(2)a(3),"…….",a(4) is an ari...

If ` a_(1),a_(2)a_(3),"…….",a_(4)` is an arithemetic progression with common difference d, then evaluate the following expression.
`tan[tan^(-1)((d)/(1+a_(1)a_(2)))+tan^(-1)((d)/(1+a_(2)a_(3)))+tan^(-1)((d)/(1+a_(3)a_(4)))+"....."+tan^(-1)((d)/(1+a_(n-1).a_(n)))]`

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