(d) cosh 2z = cosh z + sinh z, sinh 2z = 2 sinh z cosh z. tanh z1 + tanh z2 %3D 1+ tanh z1 tanh z2 (e) tanh(z1 + 2) =

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A: See this solution in detail below

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A: Given 1+i1-i-2i

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A: Topic:- algebra

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