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| 1. |
Prove that cot^2 A cosec^2B - Cot^2 B cosec^2A = cot^2A - Cot^2B. |
| Answer» REQUIRED ANSWER :)LHS = cot² A cos ec² B - cot² B ec² A= cot² A ( 1 + cot² B) - cot² B ( 1 + cot² B) = cot² A + cot² A cot² B - cot² B - cot² B cot² A = cot² A - cot² BHENCE PROVEDNote :-[ cos ec² Φ = 1 + cot² Φ ] | |