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If $\sin ^{-1} \bigg(\large\frac{3}{x}\bigg)$$+ \sin ^{-1} \bigg(\large\frac{4}{x}\bigg)=\large\frac{\pi}{2}$ then $x=$

\[\begin {array} {1 1} (1)\;3 & \quad (2)\;5 \\ (3)\;7 & \quad (4)\;11 \end {array}\]
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(2) 5
answered Nov 7, 2013 by pady_1
 
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