$$y'-y=4$$

$$\left(\sin\left(x\right)\right)^2=\frac{1}{2}$$

$$4z^2+20zw+25w^2$$

$$6x^{4}-4x^{3}y^{3}-x^{2}y^{2}$$

$$ax\left(a+b+c+d\right)$$

$$\sin\left(a\right)\cdot\sec\left(a\right)=\csc\left(a\right)$$

$$\int\frac{1}{\sqrt{x^2+1+2x}}dx$$