$-4c^2+9c^2$
$64\:-36m^2$
$\left(2^3-5\right)$
$\frac{2}{\cot\left(x\right)}+\frac{3}{\csc\left(x\right)}=0$
$b+a+c-a-c$
$1-6\sin\left(x\right)=4-8\sin\left(x\right)$
$\frac{dy}{dt}+3t^2=t^2$
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