$\left(v+5\right)\left(v-5\right)$
$-10-\left(-19\right)+10$
$7+8n-3-2n$
$\frac{secx\left(1+tanx\right)}{secx+cscx}$
$x+4^2+1$
$\lim_{x\to7}\left(-4\right)$
$a.b;\:a=-1;\:b=2$
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