1.

के. 23° tan 42° tan 67° = |

Answer»

tan 23 = cot (90-23) = cot 67.tan 42 = cot (90-42) = cot 48.

tan48 tan23 tan42 tan67 = tan48 cot67 cot48 tan67 = 1*1 = 1[tanA*cotA = 1]



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