Class 10, Trigonometry, If tan A = n tan B, Sin A = m sin B, show cos^2 A= (m^2 -1)/(n^2 -1), Very important Question for Board from Trigonometry by Deepak Rajoria

If tan A = n tan B, Sin A = m sin B
Then show that cos^2 A= (m^2 -1)/(n^2 -1)

Important questions for Class 10, Board Exam, CBSE Board.

Important questions from Trigonometry for Board Exam class 10, CBSE Board.

Solutions of all important questions for CBSE Board Exams class, 10.

Questions from Trigonometry .

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