Find the value of \[\cot 5{}^\circ \cot 10........cot85{}^\circ \].

1.	Find the value of \[\cot 5{}^\circ \cot 10........cot85{}^\circ \].
A.	1
B.	-1
C.	2
D.	-2
Answer» B. -1

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Find the value of \[\cot 5{}^\circ \cot 10........cot85{}^\circ \].

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