Q. 17 B4.1( 9 Votes )
⇒ π/12 = 15° And π/6 = 30°
We have 15° + 30° = 45°
⇒ tan(15° + 30°) = tan 45°
We know that
⇒ tan15° + tan30° = 1 – tan15° tan30°
∴ tan15° + tan30° + tan15° tan30° = 1
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