First I attempted to ipmlicitly differentiate(adsbygoogle = window.adsbygoogle || []).push({});

c2 = a2 + b2 -2abcos(theta)

da/db

I almost got the correct solution according to MIT's key, however I missed one part. The cos from the original function remained cos, and I had differentiated it to -sin.

I'm just wondering why it remained cos instead of being differentiated?

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

Dismiss Notice

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!

# Very Quick Differentiation Question

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