$f\left(x\right)=\ln\sqrt{3-1}$

$\lim_{x\to0}\left(6\right)+\lim_{x\to0}\left(x\right)$

$cosx\:cos^2y\:dx\:-\:senx\:sen2y\:dy\:=0$

$\frac{cot\left(x\right)}{sin\left(90-x\right)}csc\left(x\right)$

$\int2e^{2x}\cdot\left(e^{2x}+4\right)^3dx$

$x^{-\frac{4}{3}}$

$\csc\left(x\right)-1\sec\left(x\right)+\tan\left(x\right)$