$\left(3h\:+\:2k\:-\:3m\right)\:\left(2k\:-\:3h\:+\:2m\right)$
$2x^3+21x^2$
$\frac{d}{dx}4secx+tanx$
$\sen^{2}a-\cos^{2}a$
$\int sin5xcos3x\:dx$
$7\left(2f\right)$
$\left(x-_{\frac{\:7\pi}{6}}\right)$
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