$$43\cdot20$$

$$16+4x^6$$

$$\left(1+\sin\left(x\right)\cos\left(x\right)\right)^2$$

$$\sqrt[4]{9\left(a+3\right)^2}$$

$$\frac{\sec-1}{\tan^2}$$

$$\frac{\cos\left(8x\right)+\cos\left(6x\right)}{\sin\left(8x\right)-\sin\left(6x\right)}$$

$$\frac{dy}{dx}=24+cx+6y+xy$$