$8c\:-\:4\:+\:3c\:=\:7c\:+\:c\:+\:14$
$2^2+\left(-3\right)^3-7^3$
$a^2+9a+18$
$2\:\tan\left(2\right)+4\:\tan\left(4\right)$
$\left(2xy+y^2\right)dx-2x^2dy=0$
$\frac{6-3\sec^2\left(x\right)}{\sec^2\left(x\right)}$
$\frac{x^{-3}y^{-3}}{x^3y^{-3}}$
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