Formula:
Use the identity:
tan θ × tan (90° − θ) = 1
Solution:
We group the angles as complementary pairs:
tan 9° × tan 81° = 1 (since 9° + 81° = 90°)
tan 21° × tan 69° = 1 (since 21° + 69° = 90°)
tan 60° = √3
Now multiply all values:
1 × 1 × √3 = √3
Final Answer:
(B) √3
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