If a(1), a(2), a(3) are in arithmetic pr...

If `a_(1), a_(2), a_(3)` are in arithmetic progression and d is the common diference, then `tan^(-1)((d)/(1+a_(1)a_(2)))+tan^(-1)((d)/(1+a_(2)a_(3)))=`

`tan^(-1)((2d)/(1+a_(1)a_(3)))`

`tan^(-1)((d)/(1+a_(1)a_(3)))`

`tan^(-1)((2d)/(1+a_(2)a_(3)))`

`tan^(-1)((2)/(1-a_(1)a_(3)))`

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