1. ## Polar Curve

Q: Sketch the curve with polar equation $r=a\cos 3 \theta$, $a>0$, for $0\le\theta\le\pi$.

Can someone show me how this will look. Thanks in advance.

2. Hello

Here are some examples..

3. Originally Posted by Moo
Hello

Here are some examples..
But...mine been given limits (a range) so how would that look?

4. Originally Posted by Air
But...mine been given limits (a range) so how would that look?
The same =)

5. Originally Posted by Moo
The same =)
Oh....

...Why?

I thought we only draw the top half (from $0$ to $\pi$)? (You are correct because mark scheme says what you said so could you explain what the range is about)