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| 1. |
Prove that cot°-tan°=2cossq.°-1÷sin°cos° |
| Answer» AnswerSolving LHS:Cos⁰/sin⁰ - sin⁰/cos⁰ Cos² - sin² / sin⁰cos⁰cos² - 1 + cos²/sin⁰cos⁰2cos² - 1/sin⁰cos⁰ = RHSIdentity used :Sin² + cos² = 1 => sin² = 1 - cos² | |