$$xy'+y=0;y\left(1\right)=3$$

$$\left[-4-\left(-5\right)+5\right]-1$$

$$\frac{3}{2}sin\left(4x\right)$$

$$\frac{16x}{\frac{12y}{5z}}$$

$$\left(2m-7\right)\left(2m+7\right)$$

$$\frac{dy}{dx}cosx-ysinx=sin2x$$

$$5x+8x$$