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doc: fix typo in Effective Go
Fixes #2120. R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/4810061
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@ -2730,7 +2730,7 @@ suppresses the usual check for a <code>return</code> statement.
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<pre>
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// A toy implementation of cube root using Newton's method.
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func CubeRoot(x float64) float64 {
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z := x/3 // Arbitrary intitial value
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z := x/3 // Arbitrary initial value
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for i := 0; i < 1e6; i++ {
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prevz := z
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z -= (z*z*z-x) / (3*z*z)
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