what is the range of cos x?
no, cos 0 and cos 2pi = 1 , cos pi = -1
remember the vertical lines mean the absolute value which is positive
wait could it be zero 1-1
try putting values of cos x into the expression until you get maximimum value of g
|-1-1| = |-2| = 2 Thats the maximum value of g what value of x will give that?
cos x must equal - 1 right? so x = ?
no cos x = -1 what value of x , in radians, will give cos x = -1?
the question asks for value of x , not cos x.
look at my second post
the cos of what angle is -1? check it out with ur calculator
yes its pi because cos pi = -1
do you follow it now?
yes i do thanks:)