$9\cdot\left(-0.5\right)$
$\frac{sen\:a}{sec\:a}=sen\:a$
$5r\:-\:7\:-\:1\:-\:3r\:+\:r\:+\:4r\:+\:9\:+\:6\:-\:2r\:$
$\lim_{x\to\infty}\ln\left(x\right)^3$
$c\left(2\right)\:=\:2x\:+\:30$
$\lim_{x\to1}\left(\frac{x-1}{10x+1}\right)$
$a^2=9x^2$
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