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OpenStudy (anonymous):
Use the unit circle to find cos(-90o).
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OpenStudy (phi):
can you show the angle -90 degrees ?
OpenStudy (anonymous):
What do you mean? Is it undefined?
OpenStudy (anonymous):
@phi
OpenStudy (phi):
no, it's defined. but the first step to this problem is drawing an x-axis and y-axis, and put in -90 degrees
OpenStudy (phi):
you measure an angle from the x-axis (positive direction) negative angles means move clockwise (i.e. down) move 90 degees
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OpenStudy (anonymous):
On the unit circle?
OpenStudy (anonymous):
Wait so is it (-1,0) @phi
OpenStudy (anonymous):
Wait no (1,0)
OpenStudy (phi):
|dw:1425328022219:dw|
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