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If a(1),a(2),a(3),...,a(n) is an arithme...

If `a_(1),a_(2),a_(3),...,a_(n)` is an arithmetic 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_(n-1)*a_(n)))]`

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