$\int\:x^{3\:}\left(1+x^2\right)^{-\frac{1}{2}}dx$
$15\:sin2x^{\circ}\:=\:10cosx^{\circ}\:$
$\frac{y^4}{y^5}$
$\left(-42\right)^3$
$\lim_{x\to100}\left(\frac{6.7x}{100-x}\right)$
$\frac{d}{dx}8x^2y=-4-7xy^2$
$x-9\le-8$
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