Wednesday, 31 January 2018


If log4(x+2y)+log4(x−2y)=1, then the minimum value of |x|−|y|=.
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Define f:R→R by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \ 0, ...