$9y\:+\left[\:3x\:-\:\left(y\:+\:4x\right)\right]$
$\frac{5}{8}x^2y\:5x^2-6xy+3y^2$
$f\left(t\right)=\left(t^2+4t+8\right)\left(3t^2+4\right)$
$4\left(3\:+\:\frac{1}{4}c\:-\:\frac{1}{2}d\right)\:$
$\cot\left(x\right)-1=0$
$\frac{sen5x-senx}{cos5x+cosx}$
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