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• Identical expressions

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

• Similar expressions

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