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tianzhidaosunyouyu earned this badge 2 times
jan 5 at 22:40
How to expand $\cos nx$ with $\cos x$?
may 5 '12 at 5:00
$5^{x}+2^{y}=2^{x}+5^{y} =\frac{7}{10}$ Work out the values of $\frac{1}{x+y}$

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