How do you find the sin and cos of -9pi/2

[From: ] [author: ] [Date: 11-09-28] [Hit: ]

-pi/2 is the angle 90 degrees clockwise from 0.So, move clockwise 9 times 90 degrees and you wind up where? Find the sine of that angle.3pi/2: the angle is in positive direction, so move counterclockwise 3 time 90 degrees.......

sin and cos of -9pi/2

and sin of
-5pi/2
3pi/2

The answers are -1 and 0
-1
-1
how did they get these answers please help?!

-

On the unit circle, -pi/2 is the angle 90 degrees clockwise from 0.

So, move clockwise 9 times 90 degrees and you wind up where? Find the sine of that angle.

3pi/2: the angle is in positive direction, so move counterclockwise 3 time 90 degrees.

1

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