If $a \neq 0, \frac{1}{a}$ Is Called the Reciprocal of A $4 \mathrm{i}$

Essay

If $a \neq 0, \frac{1}{a}$ is called the reciprocal of a. Use this definition to express the reciprocal of 3 - $4 \mathrm{i}$ in the form a +bi.