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If The expression (tan 2 y-cos 2 y)=2cos2y+9 Then Find the value of cos4y

If The expression  (tan2y-cos2y)=2cos2y+9
Then Find the value of  cos4y

Grade:12th pass

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
5 years ago
find the image below
562-2366_Untitled.png

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