$\left(\sin x+1\right)\left(tanx-secx\right)=-cosx$

$1\:+12x\:+36x^2$

$\frac{sin\left(x\right)}{cos\left(x\right)}=\frac{-1}{4}$

$300\left(\frac{1}{1}\right)\left(\frac{4}{1}\right)\left(\frac{2}{1}\right)\left(\frac{.001}{1}\right)$

$xy'+2y=sen\left(x\right)$

$31y-20y+24y$

$\left(2xy-y^2\right)dx+\left(x^2-2xy\right)dy=0$