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Question

If A + B + C = 90 then cot A+cot B+cot Ccot A cot B cot C

A
1
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B
-1
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C
\N
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D
2
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Solution

The correct option is A 1
cot A+cot B+cot Ccot A cot B cot C=cot A cot B cot Ccot A cot B cot C=1

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