$\left(x+a\right)^7$
$3a-4=-7$
$-5\left(cot^2x\:-\:csc^2x\right)\:=\:5$
$\frac{dy}{dx}+xsenx=\frac{y}{x}$
$x^3\left(x^2+y^3\right)$
$\cos^2x-\frac{3}{4}=0$
$4\left|3-8\right|-4\left(5\right)$
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