Answer-cot 4˚ x cot 47˚ x cot 42.3˚ x cot 43˚ x cot 47.7˚ x cot 86˚= ?

We know that If cotA x cotB 1 then A B are complementary angles it means A B 90 Here 4 86 90 , 47 43 90 42.3 47.7 90 So cot 4 x cot 86 1, cot 47 x cot 43 1 cot 42.3 x cot 47.7 1 Hence cot 4 x cot 47 x cot 42.3 x cot 43 x cot 47.7 x cot 86 1