જો $\lim _{x \rightarrow 0^{+}} x^2\left(\frac{e^{1 / x}-e^{-1 / x}}{e^{1 / x}+e^{-1 / x}}\right)=k$ અને $\lim _{x \rightarrow 0^{-}} x^2\left(\frac{e^{1 / x}-e^{-1 / x}}{e^{1 / x}+e^{-1 / x}}\right)=l$ હોય,તો નીચેનામાંથી કયું સત્ય છે?

  • A
    $k=l=0$
  • B
    $k=1, l=-1$
  • C
    $k=-1, l=1$
  • D
    $k \neq l \neq \pm 1$

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