Posted by **Danika** on Wednesday, April 7, 2010 at 11:44pm.

suppose beta is an angle in the second quadrant and tan beta=-2. Fine the exact vaule of sin beta and cos beta

- pre calc -
**Reiny**, Wednesday, April 7, 2010 at 11:53pm
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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