What is the value of the expression (Cot...

What is the value of the expression `(Cot 1^@ cot2^@ cot3^@ Cot4^@ co5t^@ _____ Cot 90^@`

(A) O

(B) 1

(C ) 2

(D) `1/2`

A

B

C

D

A

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