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• Identical expressions

• five *cos(five *x + four) = zero
• 5 multiply by co sinus of e of (5 multiply by x plus 4) equally 0
• five multiply by co sinus of e of (five multiply by x plus four) equally zero
• 5cos(5x + 4) = 0
• 5cos5x + 4 = 0

• Similar expressions

• 5*cos(5*x - 4) = 0