$\frac{1-\cos\left(x\right)}{\cos^2\left(x\right)}$
$3x-2\ge-11$
$\frac{x^4-5x^3+8x^2-33x-32}{x-5}$
$\lim_{x\to5}\:\:sin\:\frac{\left(2x-10\right)}{\left(x-5\right)}$
$4x^2-9x+5$
$\sqrt{\left(x-y\right)\left(x+y\right)}$
$4z^2+8z+4=0$
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