How do I evaluate:(adsbygoogle = window.adsbygoogle || []).push({});

d/dt sqrt [ t^4 + t^2 ]= 0

to get a max/min value.

can I make a u substitution of some sort?

**Physics Forums | Science Articles, Homework Help, Discussion**

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!

# U substitution for differentiation?

**Physics Forums | Science Articles, Homework Help, Discussion**