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Question

The value of cot12.cot38.cot52.cot60.cot78 is:


A

1

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B

0

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C

12

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D

13

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Solution

The correct option is D

13


cot12.cot38.cot52.cot60.cot78

= cot12.cot38.tan38.13.tan12

= 13


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