$\:-\:15\:+\:\left(-30\right)\:+\:\left(-23\right)\:+\:\left(-12\right)\:+\:0\:$
$x^2-10x-25$
$\frac{sec^2a}{1+cot^2}$
$8x+14x^3$
$\left(\tan y+\cot\left(y\right)\right)\:\sin\left(y\right)\cos\left(y\right)$
$4\left(3x^2+1\right)^2-2\left(x^2+2x-5\right)^2$
$9xy+16z-9y-16xz$
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