2007-01-18 01:00:46 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
(-5,0)
x = r cos θ
y = r sin θ
2007-01-18 01:05:32 · answer #1 · answered by vincent 4 · 0⤊ 0⤋
The change of variable "formula" is x = r cos \theta, and y = r sin \theta, thus you can change (5,pi) to x = 5 cos(pi) = -5 and y = 5 sin(pi) = 0 which yields the coordinate of (-5,0).
2007-01-18 09:06:37 · answer #2 · answered by goldenflaws 2 · 0⤊ 0⤋
The third answer is correct.
But be careful: if you do any of this on a calculator (like a Ti-85), make sure your angles are set to radians and not degrees.
2007-01-18 09:07:05 · answer #3 · answered by wheresdean 4 · 0⤊ 0⤋
5cos(pi)+5sin(pi)
by formula
rcosx+rsinx
2007-01-18 09:05:05 · answer #4 · answered by amit m 1 · 1⤊ 0⤋
norm=r=5
angle=a=pi
x=rcosa=5cos180=-5
y=rsina=5sin180=0
x^2+y^2=25
2007-01-18 09:06:54 · answer #5 · answered by iyiogrenci 6 · 0⤊ 0⤋