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If A,B ,C are the angle of Delta A...

If A,B ,C are the angle of ` Delta ABC ` then ` cot A .cot B + cot B . "" cot C + cot C.cot A =`............... A) 0 B) 1 C) 2 D) -1

A

0

B

1

C

2

D

`-1`

Text Solution

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The correct Answer is:
B
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