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OpenStudy (anonymous):
Find all solutions in the interval [0, 2π). cos2x + 2 cos x + 1 = 0
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OpenStudy (mertsj):
Factor the left side.
OpenStudy (anonymous):
Just as Mertsj has suggested in the past ... consider the equation by substituting a variable in place of the trig function and ask yourself how you would factor it.
OpenStudy (anonymous):
Alright
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