cos A = 15/17 ಮತ್ತು cos B = 4/5 ಆಗಿದ್ದರೆ, cot (A - B) ಮೌಲ್ಯ ಎಷ್ಟು?

1
87/99
2
88/97
3
85/13
4
(- 84)/13

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