Posted by Gigi on Monday, July 23, 2012 at 10:08am.
convert to polar form:
1) x^2-y^2=4 (You may leave your answer for this one as r2 =)
- math - Reiny, Monday, July 23, 2012 at 10:33am
r^2 = x^2 + y^2
x/r = cosØ, and y/r = sinØ or x=rcosØ and y = rsinØ
x^2 - y^2 = 4
r^2 cos^2 Ø - r^2 sin^2Ø = 4
r^2 (cos^2 Ø - sin^2 Ø) = 4
r^2 (cos 2Ø)=4
r^2 = 4/cos 2Ø or r^2 = 4sec 2Ø
follow the same procedure for the second one, let me know what you got
- math - Gigi, Monday, July 23, 2012 at 10:53am
how did you get cos 2Ø after subtracting cos^2Ø-sin^2Ø?
- math - Reiny, Monday, July 23, 2012 at 1:08pm
One of the basic trig identities says:
cos 2A = cos^2 A - sin^2 A
Answer This Question
More Related Questions
- pre-calculus - convert the numbers to polar form and then divide.leave the ...
- precalculus - convert the equation y^2 = 2x -x^2 into polar form. convert the ...
- Pre-calculus- URGENT - Convert the rectangular coordinate (-8,i (square root of ...
- precalculus - 5x+3y=8 convert each rectangular equation to polar form Convert ...
- math - Express z = 1 + 2j in polar form then find z^3 then convert the answer to...
- Math ! Please Help ! - 1.Graph the polar equation r=3-2sin(theta) 2. Find the ...
- PRECALCULUS HELP PLEASE! - convert the polar equation to rectangular form. 1.) ...
- Maths - Polar Coordinate Systems - I've received an assignment to investigate ...
- PRECALCULUS - convert the polar equation to rectangular form. 1.) r sec(theta...
- polar form precalculus - y=x convert to polar form