$\frac{d}{dx}\left(y=x^2cos2x\right)$
$\lim_{x\to2}\left(\frac{x^2-3x+2}{x^2-5x+6}\right)$
$-7\:+\:9\:\cdot\:-3\:+\:15$
$\left(-35\right)-\left(-4\right)$
$\left(75-13\right)-\left(1+8-5-13\right)$
$81^4-1$
$4r^2-25$
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