$3x-6=12\:$
$\left(x+5\right)\cdot\left(x-5\right)+3x^2+4x-5$
$16^2+30^2$
$\frac{\sin\left(x\right)-\sin\left(x\right)\cos\left(x\right)}{\sin\left(x\right)^2}$
$\:20\:-\:12\:+\:4x\:-\:4x\:+\:x\:+\:12y\:-\:8y$
$5x^3\left(6x-9\right)$
$\sin\left(\arccos\left(0.8\right)-\arctan\left(0.6\right)\right)$
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