$\left(1+sen\:a\right)\left(1-sen\:a\right)=\frac{1}{sec^{2\:}a}$

$\frac{d^{14}}{dx^{14}}\left(2\cdot\cos\left(x\right)\right)$

$\frac{1}{x^3\left(x+1\right)}$

$125x^9-64y^{15}$

$\int\left(\frac{x+2}{x^2}\right)dx$

$y-3>-9$

$\lim_{x\to0}\left(\frac{x-ln\left(1+x\right)}{x}\right)$