Understanding Integration Minus Integration in FTOC Proof

[Petrus]

Hello MHB,
I am trying to understand FTOC Proof but I struggle on a integration minus integration, how do that works?

Regards,
$$|\pi\rangle$$

 

[alyafey22]

Hint :

Spoiler

$$-\int^x_a f(t)\, dt = \int^a_x f(t)\, dt$$

 

[Petrus]

Hint :

Spoiler

$$-\int^x_a f(t)\, dt = \int^a_x f(t)\, dt$$

Got it now! Thanks for taking your time!:)

Regards,
$$|\pi\rangle$$