$9a-12b+2a-11b$
$\frac{1}{1-\cos\left(a\right)}+\frac{1}{1+\cos\left(a\right)}$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{\ln\left(x+1\right)\cdot\cos\left(x\right)}\right)$
$1+2+3+4+w+2w+3w$
$81y^2+90y+25$
$12a^3+8a^2b^2$
$\left(8z+6\right)^2$
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