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If \(f : x → 2 tan x\) and \(g : x → √(x^2 +…

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Further Mathematics WAEC 2023

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

  • 4
  • 2√3 checkmark
  • 6
  • 3√2

The correct answer is: B

Explanation

\(f : x → 2 tan x\)

\(g : x → √(x^2 + 8)\)

\(( g o f ) = √((2 tan x)^2 + 8)\)

\(( g o f )(45º) = √((2 tan 45º)^2 + 8)\)

= √(4 + 8) = √12

= √(4 x 3)

∴ 2√3

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