$\frac{\left(2x+3\right)\left(x^2\right)-\left(x^2\right)\left(5x\right)}{\left(2x+3\right)^2}$
$log15\:1\:=\:0\:$
$x^2k^2-x^2k$
$x^3\left(x+1\right)^2$
$2a^2+a+6ba+3b-10a+20ab-5$
$3\cos\left(x\right)+4=\cos\left(x\right)+3$
$4\log\left(x\right)=2$
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