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cos(x) = (-6 +- sqrt(60))/4
= 0.436491673, -3.43649...
Obviously, cos(x) is between -1 and 1 so the second root is not true.
cos^-1(0.436491673) = 1.119100764, 5.164084543
I really hope that's not your homework.
Edit, must of been playing around with it whilst Amano was posting...
Last edited by molloby; 11-19-2004 at 03:37 PM..
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