$7x^2y^6-21x^3y^5z^2-14x^7y^4z^5$
$\left(x+1\right)\frac{dy}{dx}=\frac{x+6}{x+1}$
$faca^2+a$
$15ab\:+\:30$
$9-61+1^2$
$\frac{1}{\csc\left(x\right)+1}-\frac{1}{1+\sin\left(x\right)}=1$
$x^2-6xy+9y^2$
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