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Question
Evaluate the following : i30 + i40 + i50 + i60
Solution
i30 + i40 + i50 + i60
= (i2)15 + (i2)20 + (i2)25 + (i2)30
= (– 1)15 + (– 1)20 + (– 1)25 + (– 1)30
= – 1 + 1 – 1 + 1
= 0.
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