$\:\:\:100x^2\:-\:40x\:+4$
$\int\frac{\left(20-x\right)}{50}dx$
$\frac{cotx}{sin^2x}=\frac{csc^2x}{tanx}$
$2sin2x-4sinx=0$
$8-\left(5+1-6\right)+2$
$\frac{3x}{x+1}=\frac{12}{x^2-1}+2$
$\int\frac{x}{1+\left(x+2\right)^2}dx$
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