$\frac{x^5}{x^4+8x^2+16}$
$\frac{secx+cosx}{sec-cosx}=\frac{1+cos^2x}{sin^2x}$
$\int\:\frac{cot2x}{sen^22x}dx$
$-16x^2+32x+4=0$
$c^2-12c+-36$
$\left(\left(2.3\right)\right)-1\left(\frac{1}{23}\right)^{-1}\cdot\left(3.2^2\right)^{-2}$
$27+4^3$
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