$\left(-30\right)-311-\left(-418\right)$
$\frac{d^2y}{dx^2}+5\cdot y=0$
$4a^2+3b-9a^2-5b$
$\left|8^2-7^2\right|^2\cdot10^2-25$
$\frac{dy}{dx}+x^2y=0$
$\lim_{x\to0}\left(x\:cotx\right)$
$2a^2+3a^2+5a$
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