$\lim_{x\to\infty}\left(ln9x-ln\left(x+9\right)\right)$
$\frac{7\cdot180}{2}$
$\log9\left(x-5\right)+\log9\left(x+3\right)=1$
$24a^0$
$6x\:-9y\:+21yz\:-14xz\:$
$5x^3+5x^3$
$2\cos\left(x\right)\cdot csc\left(2x\right)=csc\left(x\right)$
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