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From table: tan20=0.3639 tan40= 0.839 cot80=0.1763. & cot20=2.7474 LHS: tan20+2 tan40+ 4 cot80= 0.3639+2(0.839)+4(0.1763)= =0.3639+1.678+0.7052=2.747=cot20 (Final answer)
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