$tan\left(135+a\right)=\frac{\tan\left(a\right)-1}{\tan\left(a\right)+1}$
$4m+9m-12m-m$
$e^y\left(sen\:2x\right)\:dx+\:cos\:x\left(e^{2y}-y\right)dy=0$
$a^3b^2+a^2b^3c+a^2b^2$
$x^3+2x^2+2x+1$
$\frac{4}{9}m^2-25n^2$
$4x+5<2x-1$
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