Question

How do you use the second fundamental theorem of Calculus to find the derivative of given `int cos(t) / t dt` from `[3, x]`?

Answer 1

`= (cos x) / x`

Explanation:

The 2nd FTC states that `d/dx int_a^x f(t) dt = f(x)`

So here `d/dx int_3^x cos(t) / t dt = (cos x) / x`