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**

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**