If \(f : x → 2 tan x\) and \(g : x → √(x^2 + 8), find ( g o f )(45^o)\)
\(f : x → 2 tan x\) \(g : x → √(x^2 + 8)\) \(( g o f ) = √((2 tan x)^2 + 8)\) \(( g o f )(45º) = √((2 tan 45º)^2 + 8)\) = √(4 + 8) = √12 = √(4 x 3) ∴ 2√3
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