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Suppose 3 sin ^(-1) ( log (2) x ) + cos...

Suppose ` 3 sin ^(-1) ( log _(2) x ) + cos^(-1) ( log _(2) y) =pi //2 " and " sin^(-1) ( log _(2) x ) + 2 cos^(-1) ( log_(2) y) = 11 pi//6`, then the value of ` x^(-2) + y^(-2)` equals

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