$\cos\left(1-x\right)$
$\left(x+4\right)\left(-x+4\right)=16$
$\int\frac{7}{\left(x+5\right)^2}dx$
$-4-4\cdot4\cdot\left(-8\right)+3\cdot2\cdot\left(-8\right)-5$
$\frac{8x^2}{x^2}$
$100\sqrt[100]{\infty}-100\sqrt[100]{1}$
$\frac{4x+12}{x-3}$
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