$\left(\frac{3}{2}z\right)-\left(\frac{3}{5}z\right)$
$z=e^{x}\sen\left(y+z\right)$
$540-135.25$
$\left(8a^{2\:}\:+\:2b\right)\:\left(8a^2\:\:-\:2b\right)$
$4v^2+36v+81$
$3.3cos\left(x\right)\:+\:3.3cos\left(90-x\right)=3.75$
$-2x+1-2x+4$
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