$5\cdot3^2-3\cdot3+12-7$
$\frac{\sin\left(x\right)}{\cos^2\left(x\right)\cos\left(x\right)}$
$r^2+14r+45$
$4w^2+36wy+81y^2$
$2.5\cdot3.6$
$\left(3x^2\:+\frac{3}{2}+2\right)^2$
$\int\sin\left(x\right)\cdot\left(5x\right)dx$
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