$9y-3b-2y-4b$
$12\left(34-2x\right)^2$
$2x^2\:.\:\left(x^2\:-\:5\right)$
$\frac{dy}{dx}=\frac{xsinx\sqrt{y^2-1}}{y}$
$4k^2+16k+25$
$18a^2+48a-96$
$\cos x+3=2-cos\:x$
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