$7+\left(-2-\left(-5+8\right)\right)$
$\lim_{x\to\infty}\left(\frac{5}{x^2-42}\right)$
$\left(4m+3n\right)\cdot\left(4m-3n\right)$
$\frac{dy}{dx}e^{\left(x+y\right)}=3e^{\left(4x-y\right)}$
$f\left(x\right)=2x-9x+20$
$z^2-18z=-15$
$\int_0^{\frac{1}{2}}\cos^{-1}xdx$
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