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| 1. |
Cos (90-theata)× cos theata ÷ tan theata + cos²( 90- theata)= 1 |
| Answer» Cos(90-theata)=sin theataTan theata =sin theata /cos theata Substitute Sin theata.cos that\'s /sin theata /cos theata +sin²theatacos²theata+sin²theata1 | |