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• Identical expressions

• -cos(x/ three)/ eighteen = zero
• minus co sinus of e of (x divide by 3) divide by 18 equally 0
• minus co sinus of e of (x divide by three) divide by eighteen equally zero
• -cosx/3/18 = 0
• -cos(x divide by 3) divide by 18 = 0

• Similar expressions

• cos(x/3)/18 = 0