$\left(ab+\left(a^2-3\right)\right)^2$
$\int\frac{x}{x^2+1.}dx$
$a\:=\:-\:4\:;\:b\:=\:5;\:c\:=\:10-8\:a\:+\:9\:b\:+\:5\:c\:$
$\int\frac{x}{\sqrt{x-4}}dx$
$\cos2a\:-\:cos\:6a$
$\int\frac{4}{cos\left(x\right)}dx$
$\frac{\left(x+6\right)}{x\left(x+1\right)}$
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