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Question
`(x + 1/x)^3`
Solution
`d/(dx)(x + 1/3)^2 = d/(dx)(x^3 + 1/x^3 + 3x + 3/x)`
= `d/(dx)(x^3 + x^-3 + 3x + 3 * x^-1)`
= `3x^2 - 3x^-4 + 3 - 3 * x^-2`
= `3x^2 - 3/x^4 + 3 - 3/x^2`
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