1.

If tan7θ.tan2θ = 1, then the value of tan3θ is?

A. $\sqrt 3 $$
B. $ - \frac{1}{{\sqrt 3 }}$$
C. $\frac{1}{{\sqrt 3 }}$$
D. $ - \sqrt 3 $$
Answer» D. $ - \sqrt 3 $$


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