$\lim_{x\to0}\left(\frac{e^x-\cos\left(x\right)}{\sqrt{1-\cos\left(x\right)}}\right)$

$\int\left(sen2x-senx\right)^2dx$

$1-\left(\frac{1}{\cos^2\left(x\right)}\right)$

$\int\left(cos\right)^6x\:dx$

$\frac { x _ { 1 } } { x _ { 1 } }$

$f\left(t\right)=\frac{1}{3}\left(\sec^{3}2t-\sec2t\right)$

$\lim_{x\to0}\left(\frac{cosx-cos3x}{sinx^2}\right)$