Roots of the equation are (z+1)^5=(z-1)^...

Roots of the equation are `(z+1)^5=(z-1)^5` are (a) `+-itan(pi/5),+-itan((2pi)/5)` (b)`+-icot(pi/5),+-icot((2pi)/5)` (c)`+-icot(pi/5),+-itan((2pi)/5)` (d)none of these

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