$56-96-50$
$\left(b-c\right)^2,\:b=6\:y\:c=4$
$16b^2+60b-100$
$\frac{cosx}{secx}=cos^2x$
$\left(2t-t+2\right)\left(t-2\right)$
$\int\left(e^{-2x}\left(-2x^3\right)\right)dx$
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