$4\cos^7\left(x\right)+3yx\cos^2\left(x\right)+\cos^2\left(x\right)$
$4n^2+12-8n$
$\frac{2tanx}{1+tan^2x}$
$a\cdot a-b\cdot b=a\cdot b-b\cdot b$
$x^2y+2xy-2x=c$
$\lim_{x\to\infty}\left(t\ln\left(1+\frac{3}{t}\right)\right)$
$-2x^3-x^2+7x+6$
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