The value of cot5^(@)*cot15^(@)* cot 25^...

The value of `cot5^(@)cot15^(@) cot 25^(@)* cot 35^(@)* cot45^(@) * cot 55^(@) * cot65^(@) * cot 75^(@) * cot 85^(@)` is ________

A

0

B

`-1`

C

`-2`

D

`1`

Verified by Experts

The correct Answer is:

D

Use `cotA*cot(90-A)=1`

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