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Concept: 1 + tan²A = sec²A, 1 + cot²A = cosec²A.
- Expression = sec²A / cosec²A = sin²A / cos²A = tan²A.
- cos A = 12/13 → sin A = 5/13 → tan A = 5/12.
- tan²A = 25/144.
Trick: Triple 5-12-13: cos = 12/13 gives tan = 5/12 instantly.
Answer: (C) 25/144
अवधारणा: 1 + tan²A = sec²A, 1 + cot²A = cosec²A।
- व्यंजक = sec²A / cosec²A = tan²A।
- cos A = 12/13 → sin A = 5/13, tan A = 5/12।
- tan²A = 25/144।
ट्रिक: 5-12-13 त्रिक से तुरंत tan = 5/12।
उत्तर: (C) 25/144
