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Matteo Jenkins
Mathematics
3 May, 06:59
when is 2cos x + 1 >0, < 0 AND = 0
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Eliana Kemp
3 May, 07:14
0
-1 < cos x < 1
-2 < 2cos x < 2
-1 < 2cos x + 1 < 3
For 2cos x + 1 > 0
0 < 2cos x + 1 < 3
-1 < 2cos x < 2
-1/2 < cos x < 1
-60 degrees < x < 120 degrees
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