Question

please answer it fast


proove that:-

1)
$\frac{a ^{ - 1} }{a ^{ - 1} + b ^{ - 1} } + \frac{a ^{ - 1} }{a ^{ - 1} - b ^{ - 1} } = \frac{2 {b}^{2} }{ {b }^{2} - {a}^{2} }$
2)
$\sqrt{x {}^{ - 1} \times y} \times \sqrt{y {}^{ - 1} \times z} \times \sqrt{z {}^{ - 1} \times x} = 1$

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Answer 1

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