$\:\left(10z+19y\right)\:\left(10z-19y\right)$
$\int_{-1}^1\left(z\sqrt{25-z^2}\right)dz$
$\int-y^4\sqrt{3y^5-5}dy$
$2\left(3x+4\right)+3x<0$
$\frac{sen}{sec}=senv$
$5-\left(-9\right)-2+\left(-13\right)$
$-x^{2\:}-\:12x\:+\:28$
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