C. 5 / 5
ExplanationStep 1: This is a conjugate product. Step 2: By (a+b)(a-b)=a²-b² we get 4 - i² = 4 + 1 = 5. Step 3: Remember i² = -1.
Step 1: यह conjugate product है। Step 2: (a+b)(a-b)=a²-b² से 4 - i² = 4 + 1 = 5। Step 3: i² = -1 याद रखें।
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