$\frac{1+cos^2x}{sen^2}=2csc^2x-1$
$2.8\cdot5$
$\left(x^5\right)\frac{1}{1+\left(x^2\right)}$
$81x^2-36xy+4y^2$
$\frac{x^{-3}y^{-4}}{x^4y^5}$
$\log_a\left(\frac{ng}{9}\right)$
$a^2+14a+33=0$
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