Puntos de inflexión
https://www.youtube.com/watch?v=C_EsS35qtwU
https://www.youtube.com/watch?v=HBbqsY4Coaw
https://www.youtube.com/watch?v=qx1xl31wdxg
https://www.youtube.com/watch?v=NCkZwuGLltc
Concavidad de una curva
https://www.youtube.com/watch?v=DWYiA6vOUwQ
https://www.youtube.com/watch?v=fl0TL3_EAus
https://www.youtube.com/watch?v=kfQaG9VbDdI
https://www.youtube.com/watch?v=UuJL8Uxu16c
https://www.youtube.com/watch?v=ucYb8Q9e3E0
https://www.youtube.com/watch?v=n0pKgYdm1MU
https://www.youtube.com/watch?v=zeBXERMLn_Q
https://www.youtube.com/watch?v=EOa2yu_swG4
https://www.youtube.com/watch?v=twmEBaHhESk