SOLUTION: (1+〖tan〗^2 θ)/(1+〖Cot〗^2 θ)=((1-tan A)/(1-Cot A))^2
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![The formula for cot (-a) [formula for the cotangent of minus a] – LUNLUN.COM](https://lunlun.com/wp-content/uploads/2020/03/The-formula-for-cot-a-formula-for-the-cotangent-of-minus-a.png "The formula for cot (-a) [formula for the cotangent of minus a] – LUNLUN.COM")
The formula for cot (-a) [formula for the cotangent of minus a] – LUNLUN.COM
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