$\int\frac{x^{\:3}-8x^2+17x-5}{x^2-7x+10}dx$

$5cos^2x-sen^2x-1=0$

$16x^2+16x+4$

$\int\frac{2x+2}{x^2-4}dx$

$\lim_{x\to0}\left(\frac{sin\left(2w\right)}{sin\left(\frac{w}{2}\right)}\right)$

$\left(cos\left(beta\right)+1\right)\left(sin\left(beta\right)cot\left(beta\right)-1\right)$

$\log_{81}\left(x\right)=.5$