Question

Hey! what is the second fundamental theorem of calculus?

Answer 1

depends on what you think the first one is. i
perhaps it is this: if \(f\) is integrable on \([a,b]\) and
\[F(x)=\int_a^xf(t)dt\] for \(x\in [a,b]\) then
\[F'(x)=f(x)\]
in english, the derivative of the integral is the integrand