Question

cos x=-1, x if 0≤x≤2pi

Answer 1

do you have a unit circle with you?

Answer 2

yes!!

Answer 3

which point on the unit circle has an x coordinate of x = -1?

what is the angle that corresponds to this point?

Answer 4

hmmm... 180° then?

Answer 5

keep it in radians

Answer 6

Unless that want the answer in degrees...

Answer 7

they...

Answer 8

they specify that x is between 0 and 2pi

Answer 9

oh, ok... so its π?

Answer 10

True. They probably want it in radians.

Answer 11

** pi

Answer 12

use `\(\pi\)` to write \(\pi\).

Answer 13

yes so x = pi is the only solution to cos(x) = -1

Answer 14

where 0 <= x <= 2pi

Answer 15

I see! Thank you :))

Answer 16

you're welcome