Saturday 23 November 2013

all irreducible fractions

Find the sum of all irreducible fractions between 10 & 20 with denominator of 3.        

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Define \(f: \mathbb{R} \rightarrow \mathbb{R}\) by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \\ 0, &a...