SOLUTION: Find all values of x that satisfy the equation 2cosx-1=0, in the interval [0, 2pi]
The correct answer is one of the following.
Which one?
A) pi/2, 3pi/2
B) pi/4, 3pi/4
Algebra ->
Equations
-> SOLUTION: Find all values of x that satisfy the equation 2cosx-1=0, in the interval [0, 2pi]
The correct answer is one of the following.
Which one?
A) pi/2, 3pi/2
B) pi/4, 3pi/4
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Question 1198604: Find all values of x that satisfy the equation 2cosx-1=0, in the interval [0, 2pi]
The correct answer is one of the following.
Which one?
A) pi/2, 3pi/2
B) pi/4, 3pi/4
C) pi/2, 3pi/4
D) pi/6, 5pi/6
E) pi/3, 5pi/3 Found 2 solutions by ikleyn, MathLover1:Answer by ikleyn(52776) (Show Source):
The given equation 2*cos(x) - 1 = 0 is equivalent to
2*cos(x) = 1, or cos(x) = ,
which has the roots x = and x = in the interval [0,) and has no other roots in this interval.
ANSWER. Option E).
Solved.
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By the way, interval [,] is shown INCORRECTLY in your post.
The standard and traditional notation for this interval is [,)
with the curved closing parenthesis.
As you write it incorrectly, I can make my conclusion about your mathematical competency.
