$\frac{\sin\left(p-q\right)}{\cos\left(p\right)\cdot\:\cos\left(q\right)}$
$\int3xc^xdx$
$7+\left(2-8-1\right)\cdot\left(8-1+6\right)$
$\sqrt{9x^2y^6}$
$2\left(2x-2\right)^2-32$
$\left(a-3\right)^2-\left(b+8\right)^2$
$81y^2-36y+4$
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