$2cos^2x-5cos+3=0$
$\left(2x+3y\right)\frac{dy}{dx}=2\left(x-y\right)$
$26\cdot24$
$\int\:\left(x^2+3x-1\right)e^{2x}dx$
$ln\:\sqrt{2-x}$
$b\cdot x=5$
$9x+7<3x-9$
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