$3x^{-3}y^{-3}\cdot4x^3y^4$
$6^2+6a$
$x-8-10x$
$\frac{3x^4y}{16y^3}$
$25v^2-60v+36$
$\cos\left(u\right)\cos\left(u+v\right)+sin\left(u\right)sin\left(u+v\right)=cos\left(v\right)$
$\left(+2\right)-\left(+65\right)$
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