$$3y^2+7y^3$$

$$\lim_{x\to\frac{\pi}{2}}\left(\sin\left(x\right)\right)$$

$$\frac{3}{4}+\cot\left(x\right)=1+\frac{1}{2}$$

$$\int x\:sen\:\left(1-x^2\right)dx$$

$$x\sin2y\frac{dy}{dx}=\left(x+1\right)^2$$

$$\lim_{x\to0}\left(\frac{\ln\left(x+1\right)}{\cos\left(\cos\left(x\right)\right)-1}\right)$$

$$x^2y+2xy=3x^2$$