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• Identical expressions

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

• Similar expressions

• cos(x)/6 = 0
• -cosx/6 = 0