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| 1. |
Prove : sin- cos +1/ sin+cos-1 = 1/sec-tan |
| Answer» Sin-cos+1/cos/sin+cos-1/cos. {Dividing Numerator&Denomenator by cos}=tan+sec-1/1-sec+tan={1-sec+tan/1-sec+tan}×1/sec-tan=1×1/sec-tan=1/sec-tan,(hence proved). | |