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

$$\frac{1+sen\left(y\right)}{cos\left(y\right)}$$

$$6\tan^2\left(x\right)+15\tan\left(x\right)-9=0$$

$$-15m+7m-4m+10m-m$$

$$0.58\:and\:\frac{4}{5}$$

$$y^2+2y+24$$

$$4xy+4x+4y+12xy-3x$$