Question

What is the derivative of `f(x) = sec(5x)`?

Answer 1

`sec(5x)tan(5x)*5`

Explanation:

The derivative of `sec(x)` is `sec(x)tan(x)`.
However since the angle is `5x` and not just `x`, we use the chain rule.
So we multiply again by the derivative of `5x` which is `5`.

This gives us our final answer as

`sec(5x)tan(5x)*5`

Hope that helped!