$-6-4r=6$
$10d-2fd-3d$
$\frac{2\tan\left(a\right)-\tan\left(b\right)}{1+2\tan\left(a\right)\cdot\tan\left(b\right)}$
$x=x\tan x$
$\frac{\left(x+2\right)\left(2x+4\right)}{-x^2-x-2}$
$xycscx-xcotx$
$\frac{2-sin^2\left(x\right)}{cos^2\left(x\right)}-1$
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