find value of the following expression:(1) i^5+i+^10+i^15
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i⁵=i
i¹⁰=-1
i¹⁵=-i
i⁵+i+i¹⁰+i¹⁵=i+i+(-1)+(-i)=i-1
Therefore,i⁵+i+i¹⁰+i¹⁵=i-1
i¹⁰=-1
i¹⁵=-i
i⁵+i+i¹⁰+i¹⁵=i+i+(-1)+(-i)=i-1
Therefore,i⁵+i+i¹⁰+i¹⁵=i-1
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