$5\cos2\left(x\right)+11\cos\left(x\right)+8=0$
$\lim_{x\to-2}\left(\frac{1}{x+2}-\frac{1}{x^2}\right)$
$\frac{d}{dx}17$
$- ( 7 n - 24 ) ^ { 2 }$
$\cos^2a-\sin^2a=-1$
$\left(x^4+2y^4\right)^2$
$8^6\cdot5^2$
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