Question

$if \frac{a}{b} = \frac{7}{9} \: then \: the \: value \: of \ \frac{x ^{2} - y^{2} }{x^{2} +y^{2} }$
please send me the answer fast
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Answer 1

a²sec²a - b²csc² a = (a²+ b²) ²

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