Teaching RPSC School Lecturer Mock Test Series 2024 Mathematics Trigonometry Trigonometric Identities

Simplify the following: 

7(cot 11° cot 13° cot 19° cot 29° cot 61° cot 71° cot 77° cot 79°) 

1
7
2
-7
3
-1
4
1
5
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