If tan A = n tan B and sin A =m sin B, prove that cos^2 A = (m^2 – 1)/(n^2 – 1). ​

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Asked: 2023-05-22T07:42:47+05:30 In: Mathematics
If tan A = n tan B and sin A =m sin B, prove that cos^2 A = (m^2 - 1)/(n^2 - 1). ​

Hi, I have a question and I hope anyone could answer it:

If tan A = n tan B and sin A =m sin B, prove that cos2A = (m2-1)/(n2-1)

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