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[tex] \sqrt{ ({ \frac{1 + a}{1 - a} })^{x} } = 1 + ax + \frac{1}{2} {a}^{2} {x}^{2} + \frac{x}{b} ( { {x}^{2} + 2 })^{3} [/tex] If a is so small that it's fourth and higher powers can be neglected then show that if [tex]x = 1[/tex] and [tex]a = \frac{1}{4} [/tex] , prove that [tex] \sqrt{15 } [/tex] ≈ [tex]3 \times \frac{111}{128} [/tex]
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