$a+b-c-b+2a-a$
$latex:\:18\sqrt{x}18\:x\:+\:25$
$\left(9-6a\right)^2$
$cotutanu-sin^2u=cos^2u$
$\frac{cot\left(x\right)}{1+csc\left(x\right)}+\frac{csc\left(x\right)}{cot\left(x\right)}$
$\sqrt{49}x^{12}$
$\int_{-5}^{20}\left(10e^{-0.4x}\right)dx$
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