$2\cos^3\left(x\right)-\cos\left(x\right)=0$
$\left(4x\cdot3x\right)+\left(x\cdot4x\right)$
$3\frac{1}{4}+2\frac{1}{8}$
$-3\left(-4\right)$
$x^2+4x\:<\:20$
$\lim_{x\to\infty}\left(5^x+3^x\right)^{\frac{1}{x}}$
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