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Question
Evaluate: tan 7° tan 23° tan 60° tan 67° tan 83°
Solution
tan 7° tan 23° tan 60° tan (90° - 23) tan (90° - 7°)
⇒ tan 7° tan 23° tan 60° cot 23° tan 60°
`1 xx 1 xx sqrt3 = sqrt3`
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