$18\::\:-9$
$800\cot\left(18.3\right)+800\cot\left(12.59\right)$
$\int_0^{2\pi}\left(sen^2ax\right)dx$
$210+10\log x=50$
$\cos\left(x\right)^2=2+2\sin\left(x\right)$
$-8a^3+15a^3$
$6x^2-6m-12$
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