$\cos\left(u-v\right)\sin\left(v\right)+\sin\left(u-v\right)\cos\left(v\right)$
$z=x\ln\left(y^2\right);\:x=rs^2-4;y=r^2e+s$
$6\left(a+b+c-x\right)$
$\left(6x^n+2a^m\right)\left(6x^n-2a^m\right)$
$\frac{x}{5}-\frac{x}{4}\leq\frac{9}{10}$
$2cos\left(x-15^\circ\right)+-1$
$\left(\sqrt{5^8}\right)^{-1}$
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