$\frac{5}{4}=\frac{x}{4}$
$y''-y'-132y\:=\:0$
$\frac{d^2}{dx^2}\sqrt{4x-3}$
$4243x+y;\:x=7;\:y=10$
$\frac{1}{\sqrt{4xy}}$
$20x^2+2x-6=0$
$\left(cos\:x\:+\:sin\:x\:\right)^2\:=\:7$
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