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OpenStudy (anonymous):
csc^4 x-4csc^2 x=0
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OpenStudy (anonymous):
csc²x - 4 = 0 csc²x = 4 1/cos²x = 4 4 cos²x = 1 cos²x = 1/4 cos x = +/- 1/2 x = 60 degrees, 120 degrees, 240 degrees, 300 degrees
sam (.sam.):
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