Question

$x = \frac{a}{b} + \frac{b}{a} \: \: and \: y = \frac{a}{b} - \frac{b}{a} \: \: \: \: if \: so \: show \: that \: x {}^{4} + y {}^{4} - 2x {}^{2} y {}^{2} = 16$
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Answer 1

Answer:

sprey...................