$0.22ln\left(10^{-2a}\:10^{2x}+1\right)$
$\left(5xm2y\right)-\left(4x-3y\right)$
$\frac{cos\left(2x\right)}{1-2\cdot sin\left(x\right)^2}$
$x^5+x^4+x^2+x$
$\left(2y^2\right)^3$
$\lim_{x\to0}\left(\frac{6x^2}{secx-1}\right)$
$\lim_{x\to10}\left(\frac{\left(e^{8x}-1-8x\right)}{x^2}\right)$
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