$f\left(10\right)=2\left(x-3\right)-.2x$
$2\left(2x+16\right)=20$
$\int\frac{x^2-x-1}{\left(x^2+1\right)^2}dx$
$\frac{\left(cos12x-cos4x\right)}{sin4x-sin12x}=tan8x$
$-\:x\:+\:2y\:-\:y\:-\:2x\:$
$\sqrt{6}\cdot\sqrt{3}\cdot\sqrt{27}$
$24\sqrt{x^2}-y^2+4$
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