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If , show that
If $\sec^{-1} x = \operatorname{cosec}^{-1} y$, show that $\frac{1}{x^2} + \frac{1}{y^2} = 1$
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From ISC 2019 Mathematics Paper 1, question 3(b).
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From ISC 2019 Mathematics Paper 1, question 3(b).