$\lim_{x\to0}\left(\frac{1+\cos\left(2x\right)}{1+cos\left(5x\right)}\right)$
$\int_0^l\left(\frac{4w}{l^2}\left(lx-x^2\right)\right)dx$
$\int\cos15xdx$
$\left(4+a\right)\left(x-2\right)$
$-11\cdot0.1111111111111111$
$\left(\frac{1}{6}a^3-\frac{3}{2}b^2\right)^5$
$\lim_{n\to3}\left(\cos\left(\frac{n}{\pi}\right)\right)$
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