4
2√3
6
3√2
Correct answer is B
f:x→2tanx
g:x→√(x2+8)
(gof)=√((2tanx)2+8)
( g o f )(45º) = √((2 tan 45º)^2 + 8)
= √(4 + 8) = √12
= √(4 x 3)
∴ 2√3
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