$\int\left(\frac{c\left(3\right)}{2f+1}\right)dx$
$\frac{8x^3-27a^3}{2x-3a}$
$\frac{sen\left(x+y\right)-sen\:\left(x-y\right)}{2cos\:x}$
$25b^2+1-10b$
$4x^2-20x+25=10$
$4\:+\:7\:-\:18\::\:\left(-\:6\:\right)\:+\:42\::\:7\:-\:8$
$9x^4y^2+30x^3y+25x^2$
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