$x^6-4x^3+2x$
$\lim_{x\to\infty}\left(\frac{x^3+1}{x^4+1}\right)$
$\left(x^2+1\right)^3\left(2x-5\right)^2$
$\left(d+4b\right)^3$
$\cos^2\left(30\right)+\cos^2\left(60\right)$
$\left(2x+40\right)x\left(2x+30\right)$
$225\cdot\frac{\pi}{180}$
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