$2x^{3\:}+3x^{2\:}-\:18x\:-\:27$
$ydx=2xdy$
$\left(3x-1\right)^2-\left(x+3\right)^2$
$sin\left(x-30\right)=-0.3$
$1-2a^3+9^6$
$\cos^2\left(a\right)\cdot\sec^2\left(a\right)=1$
$2x+3=19$
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