2 cos^3 theta-cos theta/sin theta-2 sin 3^thetha = cot theta
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Step-by-step explanation:
2Cos³O - CosO / SinO - 2Sin³O
CosO(2Cos²O - 1)/SinO(1 - 2Sin²O)
CosO*Cos2O / SinO*Cos2O
CosO/SinO = CotO
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