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| 1. |
Sec 4a=cosec (a-20) |
| Answer» Sec4a = cosec (a-20) -----1Sec4a = cosec (90-4a) ———2(from 1 and 2)Cosec (a-20) = cosec (90-4a)a-20 = 90-4a5a = 110a = 22 | |