$3,002\:-\:200$
$6z^2.\:7z^2$
$4x=400$
$\frac{5}{\cos\left(y\right)}$
$-10g+-10g+10g+10g-9g$
$sen\left(x\right)\left(1+cot\left(x\right)\right)=sen\left(x\right)+cos\left(x\right)$
$\frac{1}{y^2}\frac{dy}{ds}=\frac{-1}{y}$
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