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• Identical expressions

• two *cos(x - one) = zero
• 2 multiply by co sinus of e of (x minus 1) equally 0
• two multiply by co sinus of e of (x minus one) equally zero
• 2cos(x - 1) = 0
• 2cosx - 1 = 0

• Similar expressions

• 2*cos(x + 1) = 0