$\int_0^3\left(x\cdot22.5-65\left(x-3\right)\right)\left(-\frac{1x}{12}\right)dx$
$3+3a+10a$
$\frac{d}{dx}\left(x^x\right)\:y=x^2cos\left(x\right)$
$4x^{2}-5x-2=0$
$\tan^2x-4\tan x=0$
$7+2k+5k-3$
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