1.

If tanA = n tanB and sinA = m sinB, then the value of cos2A = ?

A. $\frac{{{m^2} + 1}}{{{n^2} + 1}}$$
B. $\frac{{{m^2} + 1}}{{{n^2} - 1}}$$
C. $\frac{{{m^2} - 1}}{{{n^2} - 1}}$$
D. $\frac{{{m^2} - 1}}{{{n^2} + 1}}$$
Answer» D. $\frac{{{m^2} - 1}}{{{n^2} + 1}}$$


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