a2 + b2
a2 - b2
2a2 +2 b2
2a2 -2 b2
Source: জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা (NSI) - ওয়াচ কনস্টেবল (ফিল্ড স্টাফ) (17-09-2021)
Answer: 2a2 +2 b2
Explanation:
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