Saturday

April 19, 2014

April 19, 2014

Posted by **Tabby** on Friday, April 20, 2012 at 3:48pm.

2 = r cos (theta + 180) on one of the graphs that looks like a flattened globe.

So far I have

2=r cos180 costheta + r sin180 sintheta

what do i do now?

- Polar equations - Help? -
**bobpursley**, Friday, April 20, 2012 at 4:03pmIsn't cos(Theta+180)= -cosTheta ?

checking the hard way...

cos(A+B)=cosAcosB-sinAsinB

cos(Theta+180)= cosThetacos180-sinThetasin180= -cosTheta.

2= -rcosTheta

r= -2/cosTheta.

Graph it.

- Polar equations - Help? -
**Tabby**, Friday, April 20, 2012 at 4:12pmthank you so much, I don't know how i missed that identity.

**Related Questions**

CHEMISTRY - Determine if it is polar or non-polar molecule: C3H6O C2H5OH SiCl4 ...

chemistry - Determine if it is polar or non-polar molecule: C3H6O C2H5OH SiCl4 ...

CHEMISTRY - Determine if it is polar or non-polar molecule: C3H6O C2H5OH SiCl4 ...

bio (plasma membrane) - I understand that the plasma membrane is composed of a ...

Calculus please help ! - 1.Graph the polar equation r=3-2sin(theta) 2. Find the ...

Math ! Please Help ! - 1.Graph the polar equation r=3-2sin(theta) 2. Find the ...

Pre-calculus; urgent ! Please help ! - 1.Graph the polar equation r=3-2sin(theta...

Drawing polar curve - How do you draw a polar curve? For example, r=2+cos2(...

Polar equations - write the polar eqaution 3 = r cos (theta - 315) in ...

Polar equations - write 3x-6y=-14 in polar form. round phi to the nearest degree