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• Identical expressions

• -i*(sign(x) - |x|/x)/x = zero
• minus i multiply by (sign(x) minus module of x| divide by x) divide by x equally 0
• minus i multiply by (sign(x) minus module of x| divide by x) divide by x equally zero
• -i(sign(x) - |x|/x)/x = 0
• -isignx - |x|/x/x = 0
• -i*(sign(x) - |x| divide by x) divide by x = 0

• Similar expressions

• -i*(sign(x) + |x|/x)/x = 0
• i*(sign(x) - |x|/x)/x = 0