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• Identical expressions

• acot(x) + acot(x) = zero
• arcco tangent of gent of (x) plus arcco tangent of gent of (x) equally 0
• arcco tangent of gent of (x) plus arcco tangent of gent of (x) equally zero
• acotx + acotx = 0

• Similar expressions

• acot(x) - acot(x) = 0
• arccot(x) + arccot(x) = 0
• arccotx + arccotx = 0