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Real Part
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\frac{\left(5+3i\right)i}{1i^{2}}
Multiply both numerator and denominator by imaginary unit i.
\frac{\left(5+3i\right)i}{-1}
By definition, i^{2} is -1. Calculate the denominator.
\frac{5i+3i^{2}}{-1}
Multiply 5+3i times i.
\frac{5i+3\left(-1\right)}{-1}
By definition, i^{2} is -1.
\frac{-3+5i}{-1}
Do the multiplications in 5i+3\left(-1\right). Reorder the terms.
3-5i
Divide -3+5i by -1 to get 3-5i.
Re(\frac{\left(5+3i\right)i}{1i^{2}})
Multiply both numerator and denominator of \frac{5+3i}{i} by imaginary unit i.
Re(\frac{\left(5+3i\right)i}{-1})
By definition, i^{2} is -1. Calculate the denominator.
Re(\frac{5i+3i^{2}}{-1})
Multiply 5+3i times i.
Re(\frac{5i+3\left(-1\right)}{-1})
By definition, i^{2} is -1.
Re(\frac{-3+5i}{-1})
Do the multiplications in 5i+3\left(-1\right). Reorder the terms.
Re(3-5i)
Divide -3+5i by -1 to get 3-5i.
3
The real part of 3-5i is 3.