$\frac{-40}{-40}$
$\left(5b^2-4c\right)^3$
$\int x^3\left(5x^4+1\right)dx$
$\frac{\sin\left(x-y\right)}{\cos\left(x\right)\cdot\cos\left(y\right)}$
$\int\:\frac{x^3+4x^2+x-1}{x^3+x^2}dx$
$x^2-6x+4=0$
$\left(sen\:x\:+1\right)^2=sen^2x+1$
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