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If tan A=n tan B and Sin A= m Sin B, then the value of Cos2A is
5Q:
If tan A=n tan B and Sin A= m Sin B, then the value of Cos2A is
- 1$$ {m^{2}+1\over {n^{2}+1}}$$false
- 2$$ {m^{2}+1\over {n^{2}-1}}$$false
- 3$$ {m^{2}-1\over {n^{2}-1}}$$true
- 4$$ {m^{2}-1\over {n^{2}+1}}$$false
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