$\frac{x^2-16}{x^2+3x-4};\:x=-4$
$\left(19+v\right)\left(v-19\right)$
$\left(\frac{3}{7}a^{2n}-\frac{4}{11}b^{5y}\right)^2$
$\left(+21\right)-\left(-8\right)$
$\frac{sen3x-2senx}{1-4sen^2x}$
$36x^2-48xy+16y^2$
$\int_0^1\left(\mathrm{sech}^2x\right)dx$
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