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January 30, 2015

January 30, 2015

Posted by **Kylie** on Sunday, December 19, 2010 at 1:55pm.

cosx + sinx = 0

- trig -
**Damon**, Sunday, December 19, 2010 at 1:59pmcos and sin are equal in magnitude at 45 degrees from the axes in all quadrants

however they are opposite in sign only in quadrants 2 and 4

so

pi-pi4/ = 3pi/4 or 135 deg

2 pi - pi/4 = 7 pi/4 = 315 deg

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