Question: Hello. Please help. Thank you. (4) Prove: (a) siniz = isinhz (b) cosiz = coshz (c) sin(x + iy) = sinxcoshy +icosxsinhy 1 1 zti

Hello. Please help. Thank you.

(4) Prove: (a) siniz = isinhz (b) cosiz = coshz (c) sin(x + iy) = sinxcoshy +icosxsinhy 1 1 zti (5) Prove that (a) cos z = =In (z+vz2 -1 ), (b) cot z= In indicating any restriction Z

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