cot theeta-tan theeta= 2cot2 theeta
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cot x - tan x = cos x/sin x -sin x/cos x
=cos²x-sin²x/(sin x cos x)
Multiply numerator and denominator by 2,
=2(cos2x)/(sin2x)=2cot2x
=cos²x-sin²x/(sin x cos x)
Multiply numerator and denominator by 2,
=2(cos2x)/(sin2x)=2cot2x
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