20. The value of lim 1) log 16 3) 3 log 2 2 tan x +4-2) 2) does not exist 4) 6log 2 DINARAYANAGROUP

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( operatorname{lt}left(1-frac{1}{2^{x}}right)left(frac{1}{sqrt{tan x+4}-sqrt{4}}right) times frac{sqrt{tan x+4}+sqrt{4}}{sqrt{tan x+4}+sqrt{4}} ) ( lim _{n rightarrow 0}left(frac{2^{n}-1}{2^{n}}right) quad frac{sqrt{tan x+4}+sqrt{4}}{tan x+4-4} ) ( lim _{x rightarrow 0}left(frac{2^{x}-1}{x}right)^{x} frac{84}{tan x} ) ( =lim _{x rightarrow 0} log 2 x frac{84}{tan x / x} ) ( Rightarrow frac{t t}{x rightarrow 0}+x frac{y}{2} log _{16} 2^{4} )

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