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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 x^(-2) + y^(-2)` equals .

A

6

B

7

C

5

D

`7/2`

Text Solution

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The correct Answer is:
A
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