$8\:sin\:x\:cos3\:x\:+\:8\:sin3\:x\:cos\:x$
$\frac{d}{dx}x^2+y^2-2x-2y$
$\frac{\sin\left(2x\right)}{sin\:x}-\frac{\cos\left(2x\right)}{cos\:x}=\frac{1}{cos\:x}$
$\lim_{x\to4}\left(x^2+2x+1\right)$
$\left(2p-7\right)\left(9p-7\right)$
$\lim_{x\to1}\:\frac{\left(1+2x\right)}{2x^2-2x}$
$\lim_{x\to\infty}\left(\arctan\left(x^2-x^4\right)\right)$
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