Question

let g(x)=|cos x-1|. the maximum value attained by g on the closed interval [0,2pi] occurs at x equal to:
a. -1
b. 0
c. pi/2
d. 2
e. pi

Answer 1

what is the range of cos x?

Answer 2

0,2?

Answer 3

no, cos 0 and cos 2pi = 1 , cos pi = -1

Answer 4

remember the vertical lines mean the absolute value which is positive

Answer 5

so -1

Answer 6

wait could it be zero 1-1

Answer 7

no

Answer 8

try putting values of cos x into the expression until you get maximimum value of g

Answer 9

2

Answer 10

|-1-1| = |-2| = 2 Thats the maximum value of g

what value of x will give that?

Answer 11

cos x must equal - 1 right?
so x = ?

Answer 12

-1

Answer 13

no cos x = -1
what value of x , in radians, will give cos x = -1?

Answer 14

the question asks for value of x , not cos x.

Answer 15

0

Answer 16

look at my second post

Answer 17

1

Answer 18

no

Answer 19

pi

Answer 20

the cos of what angle is -1?

check it out with ur calculator

Answer 21

yes its pi because cos pi = -1

Answer 22

do you follow it now?

Answer 23

yes i do thanks:)