1.

Find the value of following expression: i30 + i80 + i120

Answer»

i30 + i80 + i120 = i(28 + 2) + i80 + i120 

= (i4)7 × i2 + (i4)20 + (i4)30 

= – 1 + 1 + 1 = 1

[since i4 = 1, i2 = – 1] 

i30 + i80 + i120 = 1



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