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OpenStudy (anonymous):
cos 2x = -1/root2? can you divide two on both sides?
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OpenStudy (anonymous):
no
OpenStudy (anonymous):
how can i solve it?
OpenStudy (anonymous):
is it 2pi / 3?
OpenStudy (anonymous):
cos2x =-cos45 cos 2x = cos 135 and so on...
OpenStudy (anonymous):
i dont see where the -1/root2 comes from
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OpenStudy (anonymous):
cos 45 = -1/root2
OpenStudy (anonymous):
where does the negative come in? and isnt 45 root2/2
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