When y=sin(pi*x), why does y'=cos(pi*x)*pi, not y'=cos(pi*x)?(adsbygoogle = window.adsbygoogle || []).push({});

hk

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

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

# Homework Help: Trigonometric differentiation

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