$\left(2c^3+24a^2b^2c+6abc^2-6abc^2\right)+10c^3$
$\tan^2\theta\:+9\tan\theta\:+18=0$
$x^7\cdot x^{12}$
$x^2-14x-120$
$\left(\sec x-\cos x\right).\cot x$
$\int\frac{x^2}{x^4-20x^2-125}dx$
$3\frac{dy}{dx}=4y;\:y\left(0\right)=-1$
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