Question

42. The simplest value of cot 9° cot 27°
cot 63° cot 81° is
(1) 0
(3)-1
(4) 3
(2) 1_​

Answer 1

Answer:

1

Step-by-step explanation:

cot 9 cot (90-81) cot27 cot(90-63)

cot 9 tan 9 × cot 27 × tan 27

(cot tan) =1

1×1

=1