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z=\frac{4+3i+1}{\left(2-i\right)^{2}-2+i}
Multiply 1+2i and 2-i to get 4+3i.
z=\frac{5+3i}{\left(2-i\right)^{2}-2+i}
Add 4+3i and 1 to get 5+3i.
z=\frac{5+3i}{3-4i-2+i}
Calculate 2-i to the power of 2 and get 3-4i.
z=\frac{5+3i}{1-3i}
Do the additions in 3-4i-2+i.
z=\frac{\left(5+3i\right)\left(1+3i\right)}{\left(1-3i\right)\left(1+3i\right)}
Multiply both numerator and denominator of \frac{5+3i}{1-3i} by the complex conjugate of the denominator, 1+3i.
z=\frac{-4+18i}{10}
Do the multiplications in \frac{\left(5+3i\right)\left(1+3i\right)}{\left(1-3i\right)\left(1+3i\right)}.
z=-\frac{2}{5}+\frac{9}{5}i
Divide -4+18i by 10 to get -\frac{2}{5}+\frac{9}{5}i.