$dy=-\frac{2y}{senx}dx$

$\log_{10}\left(2ax-4a\right)-\:\log_{10}\left(2ax\right)$

$\int\frac{\left(2\cdot\:\:\:ln\left(x\right)\cdot\:\:\:sen\left(ln\left(x\right)\right)\right)}{x}dx$

$13\left(0\right)+8$

$\:x^2-8x+16x$

$\left(3xy+2\right)\left(9x^2y^2-3xyz+z^2\right)$

$\left(9x^3+y^2z\right)\left(5x^3y^4z\right)$