Find all the solutions in the interval [0, 2pi): cos x - 1 = 0?

0 ⤊

Find all the solutions in the interval [0, 2pi): cos x - 1 = 0?

a. pi/4, 7pi/4
b. pi/2, 3pi/2
c. 0
d. pi
e. none of these

2007-03-19 20:38:05 · 3 answers · asked by Wally 1 in Science & Mathematics ➔ Mathematics

3 answers

The answer is c.

cos x - 1 = 0 is the same thing as cos x = 1.

The only place between 0 and 2pi that cosine is equal to 1 is at an angle of 0. (It's equal to -1 at pi, not 1.)

2007-03-19 20:44:59 · answer #1 · answered by Jim Burnell 6 · 0⤊ 0⤋

cos x = 1
x = 0 in given interval
Answer c

2007-03-20 03:46:28 · answer #2 · answered by Como 7 · 0⤊ 0⤋

2007-03-20 03:48:12 · answer #3 · answered by Anonymous · 0⤊ 0⤋