$-2xz+xz-7xz+9xz$

$\left(1-sin^2x\right)\left(1+sin^2x\right)=0$

$\frac{1}{1+\sec\left(x\right)}$

$\frac{\left(x^7y^9\right)^3}{\left(x^{10}y^8\right)^2}$

$\int10\cdot\sin\left(x\right)\cdot\left(2x\right)^{-1}dx$

$ab\left(x+y\right)$

$\frac{\left(x-3\right)}{\left(x-1\right)}>2$