$3+6.6+3$
$\lim_{x\to\infty}\:\sqrt{x}-\sqrt{x-4}$
$11x-4y\sqrt{\left(x^2+1\right)}\frac{dy}{dx}=0$
$x\left(x-1\right)=25$
$3232+41.42$
$cos\theta\:+cos3\theta\:$
$3x^2+4x-12$
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