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• Identical expressions

• - six *cos(x) = zero
• minus 6 multiply by co sinus of e of (x) equally 0
• minus six multiply by co sinus of e of (x) equally zero
• -6cos(x) = 0
• -6cosx = 0

• Similar expressions

• 6*cos(x) = 0
• -6*cosx = 0