9. cos(3π/2+x) cos⁡(2π+x) [cot⁡(3π/2-x)+cot⁡(2π+x) ]=1

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9. cos(3π/2+x) cos⁡(2π+x) [cot⁡(3π/2-x)+cot⁡(2π+x) ]=1
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