$tan^2\:-\:sec^2\theta\:\:=-1$
$2\left(\:3x\:-\:1\right)\:=\:4$
$dy=3xydx$
$\int\frac{15}{\sqrt{x^2+25}}dx$
$b+a+c-a-c$
$\frac { 2 } { 3 } + \frac { 1 } { 3 }$
$6a^2+3ab-12ac$
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