Question: If z is a complex number, prove that (i) cos (-z) = cos z (ii) tan (- z) = -tan z (iii) cos 3z

If z is a complex number, prove that (i) cos (-z) =

If z is a complex number, prove that (i) cos (-z) = cos z (ii) tan (- z) = -tan z (iii) cos 3z = 4 cos z - 3 cos z (iv) tan z = sin 22 1+ cos 2z

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