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| 1. |
Prove that (cosec thita - cot thita) ^2 = 1-cos thita /1+cos thita... |
| Answer» (CosecA-cotA)^2=(1/sinA-cosA/sinA)^2=(1-cosA/sinA)^2=(1-cosA)(1-cosA)/sin^2A(1-cosA)(1-cosA)/(1-cosA)(1+cosA)=1-cosA/1+cosA | |