$\lim_{x\to0}\left(\frac{1-\sec\left(x\right)}{\cos\left(x\right)-1}\right)$
$f\left(x\right)=3^2-x-1^2$
$\left(1+p\right)^7$
$cos^2x+\frac{1}{sin^2x}$
$e^{-\infty^2}$
$\left(x^2-x-1\right)\left(2x-1x-2\right)$
$4x^2-4x-15$
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