$\cot\left(x\right)+\sec\left(x\right)=\frac{\csc\left(x\right)}{\cos\left(x\right)}$
$\left(x-11\right)^2=0$
$+bc-3bc+2bc$
$x-6\le19$
$\int\frac{x+7}{x^2\left(x+2\right)}dx$
$\lim_{x\to4}\left(\frac{x^3+x^2-6x}{x^2+3x}\right)$
$4-5x>2x-10$
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