Question

helpppp
For what x-value(s) does sin(x) = -1?
Answers
-270°, -90°, 90°, and 270°
-270°, -90°, 0°, 90°, and 270°
-90 and 270°
-270° and 90°

Answer 1

its -270 and 90 ?

Answer 2

@jim_thompson5910

Answer 3

sin(x) = -1 when x = 270 and this angle is coterminal to -90 degrees

this is something you either memorize or use a unit circle to determine

Answer 4

here is a unit circle

http://upload.wikimedia.org/wikipedia/commons/4/4c/Unit_circle_angles_color.svg

Answer 5

ohhhh so It would be the other way around ?

Answer 6

yes -90 and 270

Answer 7

sin(x) = 1 when x = 90, so you just had the sign flipped

Answer 8

ohh okay thank you.!(:

Answer 9

you're welcome