$\cos^2\left(x\right)=\sin^2\left(x\right)\cdot\cos^2\left(x\right)+\cos^5\left(x\right)$
$\left(-4x^4+9\right)$
$\lim_{x\to0}\left(\sqrt[2]{x+\sqrt[2]{x}}\right)$
$5p^{2}-9p+4$
$\lim_{x\to0}\left(\frac{x^2+2cos\left(x\right)}{x^2+1}\right)$
$\lim_{x\to6}\left(\frac{3+\sqrt{x}}{\sqrt{3+x}}\right)$
$3x^3-6$
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