$-9\:x\:7$
$\lim_{x\to\infty}\left(15+4x\right)$
$2cos^2\theta\:+1=2cos\theta\:+cos^2\theta\:$
$a^4-2a^4x+a^4x^2$
$y ^ { \prime } = 2 ^ { 2 x - 3 y }$
$x-5>0$
$\int\:20\sqrt[3]{3x-2}dx$
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