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$ \sin h^{-1} 2+ \sin h^{-1}3=x => \cos h\; x=$

\[\begin {array} {1 1} (1)\;\frac{1}{2} (3 \sqrt 5+2 \sqrt {10}) & \quad (2)\;\frac{1}{2}(3\sqrt {5}-2 \sqrt {10}) \\ (3)\;\frac{1}{2} (12+2 \sqrt {50})& \quad (4)\;\frac{1}{2}(12-2 \sqrt {50}) \end {array}\]

1 Answer

$ (3)\;\frac{1}{2} (12+2 \sqrt {50})$
answered Nov 7, 2013 by pady_1
 
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