## Calculus (3rd Edition)

a) The function $y=3\cos x \cot x$ can be differentiated by the product rule (covered in 3.3) and using derivatives of trigonometric functions (covered in this section). (b) The function $y=\cos x^2$ can be differentiated by the chain rule. However, we have not yet covered the chain rule (covered in 3.7) (c) We have not yet covered how to derive $2^x$ (covered in 7.1).