$\frac{1}{\sin^2m}-\frac{1}{\tan^2m}=1$
$23x^3-5x^2$
$\frac{3x^2-2x}{x}$
$y'=3x^2y$
$1-x<3$
$6x-3x-2x+5x+x$
$3xy\cdot15xy$
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