CBSE Class 11-science Answered
cos square (60-x) +cos square (60+x) belongs to
Asked by bandlapravalika4 | 25 Sep, 2020, 13:32: PM
Expert Answer
cos2(60 - x) - cos2(60 + x)
= [cos60 cosx + sin60 sinx]2 - [cos60 sinx - sin60 sinx]2
Answered by Renu Varma | 25 Sep, 2020, 17:30: PM
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