$3\left(-3\right)^2-2\left(-3\right)\left(4\right)+\left(-3\right)^2\left(-5\right)$

$44\frac{dy}{dx}=2y-1$

$x\cdot\tan\left(47\right)=\left(x+389\right)\tan\left(17\right)$

$\left(2x+3\right)\left(2y+3x\right)$

$y''-2xy+0$

$-\:\left(-4\right)\:-\:\left(-12\right)\:+\left(-4\right)\:+\:6\:-\:\left(-\:5\right)\:-\:\left(+11\right)\:-\:\left(+3\right)\:+\:9$

$\lim\:_{x\to\:\infty\:}\left(\frac{2^{x+1}}{2x}\right)$