$\log\left(x\right)=\log\left(x-4\right)+\log\left(5\right)$

$\int9xe^{-9x^2}dx$

$dy=4xdx$

$5x+2>x-6$

$\frac{1-3sen\left(y\right)-4sen^2\left(y\right)}{cos^2\left(y\right)}=\frac{1-4sen\left(y\right)}{1-sen\left(y\right)}$

$0,125-0,375-1,101$

$\frac{\left(xy^2\right)^{-2}}{\left(2x^2y^{-1}\right)^3}$