Question

Evaluate cos π - sin pi/2.

-2
-1
0
1

Answer 1

have the unit circle with u ?

Answer 2

no ):

Answer 3

http://en.wikipedia.org/wiki/File:Unit_circle_angles_color.svg

Answer 4

at angle pi
what are the co-ordinates ?

Answer 5

when you read the co-ordinates, read it as
(cos x , sin x)
so, if there's (1,0), then cos x = 1, sin x = 0

Answer 6

you still there ?

Answer 7

sorry! i was working on a different problem at first!

Answer 8

at angle pi
what are the co-ordinates ?

Answer 9

(0,1)?

Answer 10

you seeing pi or pi/2 ?