$\lim_{x\to0}\left(\left(\frac{\left(1.1\right)^n}{n^4}\right)\right)$
$\ln\left(\frac{1-x^2}{1+x^2}\right)$
$x^2x+6x-9$
$\frac{tan^2x-sin^2x}{1-cos^2x}=tan^2x$
$-12,\:5-5,\:21$
$\sin\left(1.59\right)+\cos\left(1.59\right)$
$\left(9x-3\right)^2$
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