$\lim_{x\to\infty\:}\left(\frac{200-81^{\frac{489}{x}}}{4}\right)^x$
$\left(+3\right)+\left(-4\right)-\left(+2\right)-\left(-1\right)$
$4\sqrt{\left(198.81\cdot25.96\right)}^3$
$\lim_{x\to\infty}\left(5cos\left(\frac{4x\pi+7}{12x+6}\right)\right)$
$\cos\left(x-1\right)=0.75$
$2x^2-5x+1=0$
$\left(x\:2\:+3\right)\left(2x+5\right)$
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