$cos\left(x\right)=0.35$
$\frac{225}{-15}$
$x^2-\left(1+a\right)x+a$
$\left(6ab+2c\right)^2$
$x^4-x^3+x-1$
$\lim_{x\to2}\left(x^3-3x^2+5x-1\right)$
$\int\frac{2x+1}{\left(2x-1\right)\left(x+3\right)}dx$
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