Posted by Danika on Wednesday, April 7, 2010 at 11:44pm.
draw a right-angled triangle in the second quad
so that tan B = -3/1, that is make the opposite 3 and the adjacent -1, thus the hypotenuse is √10
so y=3, x = -1, r=√10
sinB = 3/√10, cosB = -1/√10
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