(1/7a+1/14b) evaluate using identities
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(a+b)² = a²+ 2ab +b²
(1a/7+1b/14)²= (1a/7)² + 2*1a/7*1b/14 + (1b/14)²
= 1a²/49²+ 1/49 + 1b²/196² Ans.
(1a/7+1b/14)²= (1a/7)² + 2*1a/7*1b/14 + (1b/14)²
= 1a²/49²+ 1/49 + 1b²/196² Ans.
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