Question

What is \[\frac{d}{dx}(\tan x)\]?

Options

• \[\tan x\]

• \[\cos x\]

• \[\sec^2x\]

• \[-\sin x\]

Answer 1

The standard derivative of \[\tan x\] is \[\sec^2x\]. This differs from the derivative rules for \[\sin x\] and \[\cos x\].