$-\cos\left(x\right)+\sec\left(x\right)$
$\lim\:_{x\to\:0}\left(\frac{3x^2}{1-cos\left(\frac{x}{2}\right)^2}\right)$
$\frac{1}{cos\left(x\right)\left(1-sin\left(x\right)\right)}$
$23\cdot24$
$4+4x\ge2x+6$
$b^2-3b-10$
$\frac{x^2-5x+6}{x^2+6}$
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