Question

$(m + \frac{1}{m}) ^{2} - (m - \frac{1}{m} ) ^{2}$
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Answer 1

ANSWER = 4

$\boxed{ ( a+b)² - (a - b)² = 4ab}$

$\implies \: (m + \frac{1}{m} ) {}^{2} - (m + \frac{1}{m} ) {}^{2}$

$\implies \: 4.m. \frac{1}{m}$

$\implies \: 4$