$cosx-x\cdot sinx\:-\:0$
$-4+\left(-6w\right)$
$-36x\:+\:21$
$\left(x^2+y\right)dx+\left(x+y\right)dy=0$
$\lim_{x\to5}\left(\frac{x^2-10x+25}{x^2-7x+10}\right)$
$36x^4-3x^2+81$
$9x^2+6x+4$
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