$\left(\sin x-\cos x\right)\left(\sin x+\cos x\right)$
$\int_0^{\frac{1}{2}}\:\frac{cos\theta\:\cdot\:\:cot\theta\:\cdot\:\:d\theta\:}{sin\theta\:}$
$\lim_{x\to\infty}\left(\frac{x^7-6}{x^6+12}\right)$
$\frac{1-\cos\left(2x\right)}{\tan^2x}=2\cos^2x$
$\lim_{x\to0}\left(e^x+6x\right)^{\frac{6}{x}}$
$\left(x^5-2x^3-x-8\right)\left(x^2-2x+1\right)$
$x-z=14$
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