$\left(a+b+1\right)\left(a-b-1\right)$
$140,30-6$
$7x-10<5x+6$
$\frac{4-9\left(-3\right)+8}{5-2}$
$1+tan^2\left(30\right)=\sec^2\left(30\right)$
$\left(-4\right)^3-13\cdot$
$\left(5x-9y\right)^2-\left(5x+9y\right)^2$
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