alleryThe identity cosec2 A equals 1 plus:
Acot2 A
Btan2 A
Csec2 A
Dsin2 A
Answer & Solution
Correct answer: A. cot2 A
1. Divide the first identity through by sin squared A.
2. That turns it into a relation between cosec and cot.
3. The result is cosec2 A equals 1 plus cot2 A.
4. So the answer is cot2 A.
_Source: syllabus Mathematics, Ch 8 'Introduction to Trigonometry'_
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