$2r+3s-5r$
$y^4=8x-25$
$\left(4x+3y-8z\right)+\left(6y-3z\right)$
$\lim_{x\to\infty}\:\left(\arctan\left(\frac{1}{x}\right)\right)$
$\int\left(z+2m\right)^7dz$
$\int\frac{3x}{\sqrt{2-x^2}}dx$
$(3x^3)+(4x^5)$
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