$\frac{2\tan a\cdot\cot}{1+\tan^2a}$
$2x+y=13$
$\frac{dy}{dt}=ty\left(3-y\right)$
$3a+2d+6ad+5c$
$\left(x-1\right)\left(x-4\right)\left(x-6\right)\left(x-8\right)$
$25x^6+40x^3+16$
$\int\left(b-3\right)\left(b+3\right)dx$
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