$\sin\left(7x\right)\cos\left(5x\right)-\cos\left(7x\right)\sin\left(5x\right)=\cos\left(x\right)$
$\lim_{x\to\infty}\left(cos\frac{12\pi}{11^x}\right)$
$4-x\le3+2x$
$p\left(x\right)=\left(x-1\right)^2\left(x+1\right)^3$
$\frac{-1}{3x^2+3x}$
$\left(3x-1\right)\:\left(3x+5\right)$
$\left(ab\:+\:5\right)\left(ab\:+\:6\right)$
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