$cot\left(a\right)-cot\left(b\right)$
$4x^4-20x^2\:z+25z^2$
$a^2b^2c^2-a^2c^2x^2+a^2c^2y^2$
$\left(2x-5\right)\left(x+4\right)$
$\int8x\sec^2\left(x\right)dx$
$x^2x\frac{2}{5}$
$\frac{x^2+5x+6}{x+3}$
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