$\lim_{x\to0}\left(\frac{\cos\left(3x\right)-1}{e^{-x}-1}\right)$
$\left(3a^2+6\right)\left(3a^2-6\right)$
$6\:sinx+14cosx$
$\frac{3x^4+2\sqrt{2x^3}+4x^2+\sqrt{2}x-10}{3x-\sqrt{2}}$
$\frac{3}{x^3+x-2}$
$\frac{cos\theta\:-sin\theta\:}{cos\theta\:}-\frac{sin\theta\:+cos\theta\:}{sin\theta\:}$
$3m-48m+64$
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