Posted by Katie on Wednesday, February 25, 2009 at 7:12pm.
Sorry, it seems cutting from Word and pasting here doesn't work. again teh problem is.
Solve for all values of c if 0 is less than or equal to x, which is less than or equal to 2pie.
(cosine squared of 4x) + (cosine of 4x)=0
the answer is
x= pie/8, 3pie/8, 5pie/8, 7pie/8, 9pie/8, 11pie/8, 13pie/8, 15pie/8, pie/4, 3pie/4, 5pie/4, 7pie/4
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