While solving an equation, the lecturer was using substitution in this video:(adsbygoogle = window.adsbygoogle || []).push({});

x=au was subbed in for Psi at timestamp 39:27

d/dx = (1/a)(d/du). I get that.

But then the second derivative is stated as being

d2/dx2 = (1/a2)(d2/du2)

How is it (1/a2) if we do not know if there is an "a" in the function "u"?

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# I Chain rule found in MIT video

Have something to add?

Draft saved
Draft deleted

Loading...

Similar Threads - Chain rule found | Date |
---|---|

Chain rule | Jan 23, 2016 |

Chain rule | Feb 10, 2014 |

Check whether I am correct in Chain Rule | Oct 29, 2013 |

The chain rule (PDE) | Feb 8, 2012 |

Chain rule for implicit differentiation | Jan 21, 2012 |

**Physics Forums - The Fusion of Science and Community**