1.

If sin h^(-1) (2) + sin h^(-1) (3) = x then cos h(x) =

Answer»

`(1)/(2) (3 sqrt(5) + 2 sqrt(10))`
`(1)/(2) (3 sqrt(5) - 2 sqrt(10))`
`(1)/(2) (12 + 2 sqrt(50))`
`(1)/(2) (12 - 2 sqrt(50))`

ANSWER :C


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