$\int10x^{-1}dx$
$2cos^2x+1=2$
$-6x^3-x^3$
$\frac{3x-5}{4}-\frac{x-6}{12}<1$
$x^2=x+20$
$\frac{\left(2a+6\right)}{\left(a^2+a-6\right)}\cdot a^2-4$
$a+b\:restar\:a-b$
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