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| 1. |
CotA + tanB/cotB + tanA = cotA × tanB |
| Answer» LHS: cotA + tanB / cotB + tanA= (cotA + 1/cotB) / (cotB + 1/cotA)= (cotAcotB + 1) / cotB / (cotAcotB + 1) / cotA= cotA / cotB= cotAtanB= RHS hence proved. | |