$cos^4\left(4x\right)=\frac{9}{16}$
$\frac{x^5-x^4+x^2-2}{x^2+1}8$
$x^2+10x\:+35$
$4^{-5}\cdot4^5$
$\sqrt{x}\cdot\sqrt{x}\cdot\sqrt{x}$
$\frac{1+sec\left(x\right)}{1-sec\left(x\right)}$
$1-5\cos\left(x\right)=6$
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