cot 1^(@) cot 23^(@) cot 45^(@) cot 67^(...

`cot 1^(@) cot 23^(@) cot 45^(@) cot 67^(@) cot 89^(@)` किसके बराबर है ?

A

A)0

B

B)1

C

C)`(1)/(2)`

D

D)`(1)/(3)`

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