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Question

Express the given complex number in the form a+ib:i9+i19

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Solution

i9+i19=i4×2+1+i4×4+3
=(i4)2.i+(i4)4.i3
=1×i+1×(i),[i4=1,i2=1]
=i+(i)=0=a+ib, where, a=0,b=0

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