$\left(m^4n-3.5\right)^2$
$\frac{2senx}{cscx}+\frac{2cosx}{secx}$
$\left(3m\:-\:7n\right)\left(3m\:+\:7n\right)$
$3x^2-30x$
$12x-6y=36$
$3\:-\:12\:\cdot\:-4\:+\:7$
$\frac{dl}{dp}=\frac{l}{2},\:l\left(0\right)=40$
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