$4x^2+6\le0$
$\frac{1-2sin^2x}{cosx+sinx}+2sin\frac{x}{2}cos\frac{x}{2}=cosx$
$\lim_{x\to\infty}\left(\frac{3x+1}{3x}\right)^x$
$x^4-49y^2$
$\int_1^5\ln\left(\left|x^2-4x\right|\right)dx$
$x^2+15x-1500$
$y'=\left(x+y\right)ln\left(x+y\right)-1$
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