If tanA = ntanB and sinA = msinB , then prove that cos square A = m square - 1 upon n square + 1

If tanA = ntanB and sinA = msinB , then prove that cos square A = m sq

1.	If tanA = ntanB and sinA = msinB , then prove that cos square A = m square - 1 upon n square + 1
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