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• Identical expressions

• -sin(x)*sign(cos(x) + one) = zero
• minus sinus of (x) multiply by sign( co sinus of e of (x) plus 1) equally 0
• minus sinus of (x) multiply by sign( co sinus of e of (x) plus one) equally zero
• -sin(x)sign(cos(x) + 1) = 0
• -sinxsigncosx + 1 = 0

• Similar expressions

• sin(x)*sign(cos(x) + 1) = 0
• -sin(x)*sign(cos(x) - 1) = 0
• -sinx*sign(cosx + 1) = 0