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Function f(x) is continuous on its domai...

Function f(x) is continuous on its domain [-2,2],where f(x) = `(sinax)/x`+2, for `-2 le x lt0`
`=3x+5`, for `0 le x le 1`
=`sqrt(x^2+8)-b, for `1 lt x le 2`
Find the value of a+b+2

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