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(5.4.2) This is cute proof that the Pythagorean identity sin”(@) + cos(@) = 1 extends to the complex plane. For this problem let g(x) = sin2x+ + cosz. Do the steps below and then combine them to justify 9(2) = 1.

  • Show that the function g ( z ) is entire
  • Compute the derivative g ′ ( z )
  • Compute g ( 0 )

Show sin( z ) = sin( x )cosh( y ) + i cos( x )sinh( y )

Where is ZHsin() differentiable? Analytic?

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