$\left(2b^{4}\right)^{-1}$
$\lim_{x\to0}\left(\frac{1-\cos\:\left(x\right)^2}{4x}\right)$
$\lim_{x\to+0}\left(x^3\ln\left(x\right)\right)$
$sin\:3x+1\:=0$
$x^2+1x-600$
$\frac{\left(-48\right)}{\left(-1\right)}$
$\sec\left(2a\right)+\tan\left(2a\right)$
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