$\lim_{x\to-2}\left(\frac{3x-6}{2x^2+3x-14}\right)$
$r\sqrt{1-cos^2x}+\sqrt{4-r^2}cosx$
$6\left(2r+-9\right)$
$\frac{\left(1+cosx\right)}{e^x\left(x+1\right)}$
$2\:x^{\left(2\right)}+5\:x<-x^{\left(2\right)}+1$
$\frac{x^5}{5}-2x^2+c$
$4xy-xy$
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