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If tan ^(-1) x + tan ^(-1) .sqrt( 1 - y...

If ` tan ^(-1) x + tan ^(-1) .sqrt( 1 - y^(2))/y = pi/3 "` and
`sin^(-1) y - cos^(-1) ( x/(sqrt( 1 + x^(2)))) = (pi)/6 ` , then `( 5 sin^(-1) x)/( sin^(-1) y) ` is

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