ok.. title says it all I feeling really stupid right now and seem to be having trouble with elementary stuff here..(adsbygoogle = window.adsbygoogle || []).push({});

given r= sin 3x

dr= cos 3x * 3

dx

i got that . but next step in the equation i am doing is

3cos 3x * cos x

as i said feeling stupid si it

3 cos^2 3x?

**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!

# Easy trig stuffI jsut feeling dumb

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