Posted by Tabby on Friday, April 20, 2012 at 3:48pm.
i need to graph the polar equation
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 4:03pm
Isn't cos(Theta+180)= cosTheta ?
checking the hard way...
cos(A+B)=cosAcosBsinAsinB
cos(Theta+180)= cosThetacos180sinThetasin180= cosTheta.
2= rcosTheta
r= 2/cosTheta.
Graph it.

Polar equations  Help?  Tabby, Friday, April 20, 2012 at 4:12pm
thank you so much, I don't know how i missed that identity.
Answer This Question
Related Questions
 precalculus  Graph the polar equation: 2=r cos(theta + 180) 2=r(costheta ...
 Drawing polar curve  How do you draw a polar curve? For example, r=2+cos2(...
 Precalculus; urgent ! Please help !  1.Graph the polar equation r=32sin(theta...
 Calculus please help !  1.Graph the polar equation r=32sin(theta) 2. Find the ...
 Math ! Please Help !  1.Graph the polar equation r=32sin(theta) 2. Find the ...
 math  put these polar equations into cartesians form: 1) theta=135 degrees 2)...
 math  change equations to polar form: 1) y= 1 2) x^2 + y^2 = 4 how would i do ...
 Calculus  I wanted to confirm that I solved these problems correctly (we had to...
 calculus  for what value of r=4sinĂ¨ have vertical tangent? In polar coordinates...
 math  what does the polar equation r=1/(sintheta + costheta) represent? how do ...
More Related Questions