Can someone help me figure out how to graph leminscates in calculus? Our class is a little confused because we are trying to use the calculator and we aren't sure if we use +/- or not. If anyone can give me some tips please? any help is greatly appreciated. @phi

Question

phi · Answer

what is the equation ?

anonymous · Answer

We are working with square root os cos(2theta), and i know that it is a figure 8 but its just a little tricky because its undefined in the table of the calculator. I'm also a little confused on what the period is exactly for these graphs.

phi · Answer

the period to theta= 0 to 2pi

anonymous · Answer

ok well im going to work on it later tonight, thanks for your help!

phi · Answer

if you do it by hand,  say from theta = 0 to pi/2  you get numbers like
theta       r
0             1
10º         0.97
30º          0.71
45º          0                    

from 45 to 134.999 you get imaginary numbers  (so dump those)
135           0
145          0.58
160           0.87
180            1

190            0.97
225            0

225 to 315  are imaginary
315           0
330           0.71
360            1

phi · Answer

with a calculator you have to leave out certain ranges of angles.