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If "tan" alpha= n tan beta and sin alpha...

If `"tan" alpha= n tan beta and sin alpha =m sin beta` prove that :
`cos^(2)alpha=(m^(2)-1)/(n^(2)-1)`

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MODERN PUBLICATION-TRIGONOMETRY-Exercise 3(b) Long Answer type Question-II
  1. If "tan" alpha= n tan beta and sin alpha =m sin beta prove that : c...

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