Prove that :
Taking LHS
= tan 7° tan 23° tan 60° tan 67° tan 83°
=cot(90° - 7°) tan (90° - 23°) tan 60° tan 67° tan 83° [∵ tan θ = cot (90° - θ)]
=cot 83° cot 67° tan 60° tan 67° tan 83° 
= tan 60° [∵ tan 60° =√3]
=√3 =RHS
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