5.1 Using Fundamental Identities

$$\left(x-1\right)\left(x-1\right)$$

$$\left(x-2\right)\left(x-1\right)$$

$$\left(x+1\right)\left(x-1\right)$$

$$\left(x-2\right)\left(x+1\right)$$

$$\left(x-3\right)\left(x+4\right)$$

$$\left(2x-3\right)\left(2x+1\right)$$

$$\left(x+1\right)\left(4x-3\right)$$

$$\left(x-3\right)\left(x+1\right)$$

$$\left(4x-3\right)\left(x+1\right)$$

$$\left(x-3\right)\left(x-2\right)$$

$$\left(2x+3\right)\left(x+2\right)$$

$$\left(x-2\right)\left(2x+3\right)$$

$$\left(x+1\right)\left(x+1\right)$$

$$\left(x+1\right)\left(x-1\right)$$

$$\left(x-1\right)\left(x-1\right)$$

$$x-1$$

$$\left(2x+1\right)\left(2x-1\right)$$

$$\left(1-2x\right)\left(1+2x\right)$$

$$\left(4x-1\right)\left(x+1\right)$$

$$\left(1-x\right)\left(1+4x\right)$$

$$x\left(y^2-x\right)$$

$$x\left(y-1\right)$$

$$x\left(y^2-1\right)$$

$$xy\left(y-1\right)$$

$$\sin\left(x\right)\left[\cos^2\left(x\right)-\sin\left(x\right)\right]$$

$$\sin\left(x\right)\left[\cos^2\left(x\right)-1\right]$$

$$\sin\left(x\right)\cos\left(x\right)\left[\cos\left(x\right)+1\right]$$