$\frac{z^9+y^9}{z+y}$
$8-2+4-7-6+5+10+15-45+6$
$-\frac{sin\left(x\right)}{sec\left(x\right)}$
$\frac{x^2}{x^2+1}=1$
$\left(3x-2y^3\right)^2$
$\left(-5-3h\right)\left(-6\right)$
$\left(10x^2+8\right)x\left(2+4x\right)$
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