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Mathematics

If x = 0.1, then the value of [1(1[1x3](1))(1)](13)[1 - ({1 - [1 - x^3]^{(-1)}}) ^{(-1)}]^{\Big(\dfrac{-1}{3}\Big)} is:

  1. 0

  2. 1

  3. 0.1

  4. -1.1

Indices

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Answer

Simplifying the expression :

[1(1[1x3](1))(1)]13[1(111x3)1]13[1(1x311x3)1]13[1(x31x3)1]13[1(x3x31)1]13[1x31x3]13[x3x3+1x3]13[1x3]13(x3)13x0.1\Rightarrow [1 - (1 - [1 - x^3]^{(-1)})^{(-1)}]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[1 - \Big(1 - \dfrac{1}{1 - x^3}\Big)^{-1}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[1 - \Big(\dfrac{1 - x^3 - 1}{1 - x^3}\Big)^{-1}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[1 - \Big(\dfrac{-x^3}{1 - x^3}\Big)^{-1}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[1 - \Big(\dfrac{x^3}{x^3 - 1}\Big)^{-1}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[1 - \dfrac{x^3 - 1}{x^3}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[\dfrac{x^3 - x^3 + 1}{x^3}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow \Big[\dfrac{1}{x^3}\Big]^{-\dfrac{1}{3}} \\[1em] \Rightarrow (x^3)^{\dfrac{1}{3}} \\[1em] \Rightarrow x \\[1em] \Rightarrow 0.1

Hence, option 3 is the correct option.

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