$\lim_{x\to0}\left(\frac{ln\left(cos10x\right)}{ln\left(cos6x\right)}\right)$
$\frac{a^2-5a+1}{a-2}$
$\left(7x^4-x+2\right)\left(x^5+4\right)$
$x+15=18$
$\int_{-1}^3\left(\frac{2}{x^3}\right)dx$
$\left(2i-3\right)^2\cdot i$
$2-2\left(\tan^2\left(x\right)\right)$
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