$x^'\:=\:ax$
$\frac{dx}{dy}=\frac{1+x}{x^7y^{10}}$
$66=\frac{x^2-x}{2}$
$\frac{\sin\left(x\right)\left(\cos\left(x\right)-1\right)}{\cos\left(x\right)}$
$6.84+0.28\cdot0.8$
$\lim_{x\to4}\left(\sqrt{x^2-1}\right)$
$f\left(x\right)=\frac{x}{5x}$
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