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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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