Express each of the complex number in the form \( a+i b \) 1. \( (5 i)\left(-\frac{3}{5} i\right...

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Express each of the complex number
in the form \( a+i b \)
1. \( (5 i)\left(-\frac{3}{5} i\right) \)
\[
\begin{aligned}
& 2 . i^{9}+i^{19} \\
- & 3 . i^{-49}
\end{aligned}
\]
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