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Cos α = 2.Cos² (α/2) - 1 = 2.(2x+1)/4x - 1 = (4x + 2 - 4x)/4x
Cos α = 2/4x = 1/2x
Tan² α + 1 = 1/Cos² α
Tan² α + 1 = 1/1/4x²
Tan² α + 1 = 4x²
Tan² α = 4x² - 1
Tan α = √(4x² - 1)
Cot α = 1 / Tan α = 1 / √(4x² - 1)
Cot α = √( 1/(4x² - 1) ) ... C