$0=1-3\arccos\left(2x\right)$
$\int_{-1}^2\left(\frac{4}{x^2}\right)dx$
$\lim_{x\to5}\left(\frac{cos7x-1}{x^2}\right)$
$4=\frac{2}{7}x$
$891-274$
$\left(2xy-2y\right)+\left(-2y\right)$
$\left(3x^4+\frac{7}{2}\right)\left(2x+\frac{3}{2}\right)$
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