$\lim_{x\to+0}\frac{ln\left(tan2x\right)}{ln\left(tan3x\right)}$
$\cos^2x-2\cos x+1$
$x^2+y^2-20x-2y+52+0$
$9e-7=7e-11$
$14a^2b^2c-21ab^3c^2$
$8\sin\left(x\right)=2+\frac{5}{\csc\left(x\right)}$
$\lim_{x\to\infty}\left(\sqrt{x-2}-\sqrt{x-4}\right)$
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