(adsbygoogle = window.adsbygoogle || []).push({}); Few stupid questions about polar curves and stuff....

Okay, here's the first dumb question. I have to find the tangent line where r=2-3sin(T) at the polar point (2,pi). To find the slope, you just take dy/dx, and I come up with 2/3. I know that part is right.

T=theta (I know it's spelled wrong)

But how do I turn this into an equation for the tangent line? Do I just use y=mx+b? That seems too simple for this, and I would think she would want it in polar coordinates, not cartesian.

Secondly, what (cos2(T))^2. is it 2cos(2T) or 2 cos(4T) or what? I know we learned this like 2 years ago, but I just can't remember anymore.

Thanks guys!!!

**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!

# Few stupid questions about polar curves and stuff

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