$cos\left(x\right)=\frac{sen\left(x\right)+cot\left(x\right)}{tan\left(x\right)csc\left(x\right)}$

$x^2-50x+25$

$x^2+1\frac{1}{x^2}$

$\left(x-\:5y\right)^2$

$\frac{dy}{dx}+a\left(x\right)y=0$

$3a^2\left(ab+ac+bc\right)$

$\lim_{x\to0}\left(6sin\left(x\right)^{8tan\left(x\right)}\right)$