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• Identical expressions

• - fifty *cos(five *x) = zero
• minus 50 multiply by co sinus of e of (5 multiply by x) equally 0
• minus fifty multiply by co sinus of e of (five multiply by x) equally zero
• -50cos(5x) = 0
• -50cos5x = 0

• Similar expressions

• 50*cos(5*x) = 0