1.

tand8 tan23 tand? tan67 = 1 A,

Answer»

tan48 = tan(90-42) = cot42 tan23 = tan(90-67) = cot67 tan48*tan23*tan42*tan67 = cot42*cot67*tan42*tan67 = cot42*tan42*tan67*cot67 = 1*1 = 1



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