Prove that :
Taking LHS
= tan 15° tan 25° tan 60° tan 65° tan 75°
=cot(90° - 15°) tan (90° - 25°) tan 60° tan 65° tan 75° [∵ tan θ = cot (90° - θ)]
=cot 75° cot 65° tan 60° tan 65° tan 75° 
= tan 60° [∵ tan 60° =√3]
=√3 =RHS
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