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=Sec39°/ Cosec51° +2/√3 ×Tan38°×Tan60°×Tan52°×Tan73° -3(Sin^2 31° + Sin^2 59°)
=(Sec39/Sec39 )+
(2√3)×(Tan17°×Tan38°×Tan60×Cot38°×Cot17°) -3(Sin^2 31° +Cos^2 31°)
= 1 + 2/√3 ×Tan60° -3(1)
= 1+ ( 2/√3) ×√3 -1
= 1 +2 -1
=2
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