$cos^2x\:\left(tan^2\:x\:+\:1\right)$
$2\tan x=4-\sec^2x$
$\frac{dy}{dt}=y+t\:\:;y\left(0\right)=0$
$7bc+15bd+4bc-12bd$
$\left|-2\:\:\:\:\:1\right|\:\cdot\left|5\:\:2\:\:\right|\:\cdot\:21$
$\frac{2^x}{2^2}$
$\int\frac{21x-33}{\left(x-1\right)\left(x-3\right)\left(x+2\right)}dx$
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