Express the complex numbers in the form of a + ib:

$i^{9} + i^{19}$

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Solution

$i^{9} + i^{19}$ $= (i^{2})^{4} . i + (i^{2})^{9} . i = (- 1)^{4} . i + (- 1)^{9} . i = i - i = 0$

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