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CBSE Class 12-science Answered

cos¯¹[cos(680°)]
Asked by harsharyan363 | 15 Aug, 2020, 03:07: PM
answered-by-expert Expert Answer
To find the value of cos-1[cos(680°)] 
680 = 720 - 40
cos-1[cos(680°)] = cos-1[cos(720° - 40°)] = cos-1[cos(4𝜋 - 40°)] = cos-1[cos(40°)] = 40° = 2𝜋/9
Answered by Renu Varma | 18 Aug, 2020, 12:36: PM
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