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1. 1/2{(a + b)2 + (a - b)2} = কত?
- A. a2 + b2
- B. a2 + b2
- C. a2 + b2
- D. a2 + b2
Answer: Option A
Explanation:
1/2{(a + b)^2 + (a - b)^2
= 1/2(a^2 + 2ab + b^2 + a^2 - 2ab + b^2)
= 1/2(2a^2 + 2b^2)
= 1/2*2(a^2 + b^2)
= (a^2 + b^2)
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