a=undefined
b=0
c=-1
d=1
2007-06-17 07:57:26 · 6 answers · asked by jessie0420 2 in Science & Mathematics ➔ Mathematics
4π is but a multiple of 2π thus:-
cos 4π = cos 2π = 1
ANSWER d
2007-06-17 19:53:22 · answer #1 · answered by Como 7 · 0⤊ 0⤋
cos x for 4pi is 1
2007-06-17 08:14:45 · answer #2 · answered by willie d 2 · 0⤊ 0⤋
4pi = 2pi
cos 2pi = 1
y = 1 for cos 0, cos 2pi, cos 4pi, cos 6pi etc.
So d is the answer.
All Silver Tea Cups is the formula to remember. In the first quadrant x = 0 to pi/2, all (sin, cos and tan) are + ve, in the second quadrant, x = pi/2 to pi sim is positive and others -ve, in the third quadrant x = pi to 3pi/2, tan is +ve and others -ve, and in the fourth quadrant, x = 3pi/2 to 2pi, cos is +ve and others -ve.
2007-06-17 08:03:24 · answer #3 · answered by Swamy 7 · 0⤊ 0⤋
4pi = 720 degrees
cos(4Pi) = 1
2007-06-17 08:01:17 · answer #4 · answered by ctmtz 2 · 0⤊ 0⤋
cos(4pi)
means 720now use ur calculator find cos720 it is 1
so d is correct
2007-06-17 08:03:54 · answer #5 · answered by ghulamalimurtaza 3 · 0⤊ 0⤋
take four times pi, then put it in for place of x
so y=cos of (3.14 times 4)
maybe?
idk for sure, it be to early to think
2007-06-17 08:03:12 · answer #6 · answered by deep 2 · 0⤊ 0⤋