$18-\left(-3\right)$
$400a^2-25b^2$
$x^2-2x+15=0$
$\frac{dy}{dx}=\left(\cos\left(x\right)\right)^2-\tan\left(x\right)y$
$20x^2-25x-800$
$-5\:+\:\:\:-3+4-\left[\:-1+7-3-\:\left(4-5+1\right)\:-2\right]\:-3$
$\frac{4ac+b}{2}$
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