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require 'complex'
Complex::I # => Complex(0, 1)
a = Complex(1, 4) # => Complex(1, 4)
a.real # => 1
a.image # => 4
b = Complex(1.5, 4.25) # => Complex(1.5, 4.25)
b + 1.5 # => Complex(3.0, 4.25)
b + 1.5*Complex::I # => Complex(1.5, 5.75)
a - b # => Complex(-0.5, -0.25)
a * b # => Complex(-15.5, 10.25)
b.conjugate # => Complex(1.5, -4.25)
Math::sin(b)
# => Complex(34.9720129257216, 2.47902583958724)
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