Question

cos(3x) = -1 solve for x

Answer 1

remember cos 180 = -1
therefore:
cos(3x) = cos (180)
3x=180
x=???

Answer 2

60???

Answer 3

right

Answer 4

it should have more than one solution

Answer 5

how many should it have?

Answer 6

four

Answer 7

so part from 180, what are the other angles with a cosine of -1?

Answer 8

try 3x=540; 3x=900; 3x=1620, find the x values

Answer 9

it has to be in radians

Answer 10

\[\Pi rads= 180^{0}\]
so can you convert 180,540,900 and 1620 into rads?

Answer 11

yes i can. Thanks