missaavidhi8k
missaavidhi8k
31-07-2016
Mathematics
contestada
when is 2cos x + 1 >0 , < 0 AND = 0
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nobillionaireNobley
nobillionaireNobley
31-07-2016
-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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