J JasonMC New member Joined Oct 16, 2011 Messages 1 Oct 16, 2011 #1 I'm having difficulty with this one problem: COS(-3pi/4) Its the negative. I don't understand how to evaluate it properly. Thanks!!
I'm having difficulty with this one problem: COS(-3pi/4) Its the negative. I don't understand how to evaluate it properly. Thanks!!
D daon2 Full Member Joined Aug 17, 2011 Messages 999 Oct 16, 2011 #2 cos(-x) = cos(x). Careful though, sin(-x) = -sin(x). From here you should be able to work out how every trigonometric function handles negatives...
cos(-x) = cos(x). Careful though, sin(-x) = -sin(x). From here you should be able to work out how every trigonometric function handles negatives...
