Answer :

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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