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Q:

If tan A=n tan B and Sin A= m Sin B, then the value of Cos2A is

  • 1
    $$ {m^{2}+1\over {n^{2}+1}}$$
  • 2
    $$ {m^{2}+1\over {n^{2}-1}}$$
  • 3
    $$ {m^{2}-1\over {n^{2}-1}}$$
  • 4
    $$ {m^{2}-1\over {n^{2}+1}}$$
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Answer : 3. "$$ {m^{2}-1\over {n^{2}-1}}$$"

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