$x+\frac{y}{2};\:x=3y=4$
$x^2-11x-34$
$\int\frac{2x^2-x+1}{x^4-4x^2}dx$
$\left(6-4x+x^2\right)^2$
$\int3x\cdot e^{-4x}dx$
$2x^2+6x+3=0$
$\lim_{x\to0}\left(-ln\left(cos\right)\right)$
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