Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

cot A + cos A = m ಮತ್ತು cot A – cos A = n ಆಗಿದ್ದರೆ, ಈ ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವುದು ಸರಿಯಾದ ಉಕ್ತಿಯಾಗಿದೆ?

1
(m2 - n2)2 = 4 mn
2
(m2 - n2)2 = 16 mn
3
m2 - n2 = 16 mn
4
m2 + n2 = 4 mn

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