$\sin2x=5\sin x$
$124x^3+15x$
$\frac{dy}{dx}=y\left(1-2lny\right)$
$-\frac{1}{3}xy-\frac{2}{3}xy$
$\left(15\right)\left(-45\right)$
$12-\left(6x+3x^3-147x\right)-4x^2-12x-9$
$7b\:-\:3b\:+\:4$
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