According to the final result in Exercise 2(b), sin(z + z2) = sin z cos z2 +
Question:
sin(z + z2) = sin z cos z2 + cos z sin z2.
By differentiating each side here with respect to z and then setting z = z1, derive the expression
cos(z1 + z2) = cos z1 cos z2 − sin z1 sin z2
that was stated in Sec. 34.
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We know from Exercise 2b that sin z z 2 sin z ...View the full answer
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Related Book For
Complex Variables and Applications
ISBN: 978-0073051949
8th edition
Authors: James Brown, Ruel Churchill
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