Jawaban dari nomor 2?

[tex] \frac{ {x}^{2} }{ 1 - \sqrt{1 + {x}^{2} } } \times \frac{1 + \sqrt{1 + {x}^{2} } }{1 + \sqrt{1 + {x}^{2} } } \\ = \frac{ {x}^{2}(1 + \sqrt{1 + {x}^{2} }) }{1 - (1 + {x}^{2} )} \\ = \frac{ {x}^{2} (1 + \sqrt{1 + {x}^{2} }) }{1 - 1 - {x}^{2} } \\ = \frac{ {x}^{2}(1 + \sqrt{1 + {x}^{2} } ) }{ - {x}^{2} } \\ \\ coret \: \: {x}^{2} \\ \\ = \frac{1 + \sqrt{1 + {x}^{2} } }{ - 1} \\ \\ subt \: \: x = 0 \\ \\ = \frac{1 + \sqrt{1 + 0} }{ - 1} \\ = \frac{1 + \sqrt{1} }{ - 1} \\ = \frac{1 + 1}{ - 1} = \frac{2}{ - 1} = - 2[/tex]



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