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• Identical expressions

• -cos(x/ two)/ eight = zero
• minus co sinus of e of (x divide by 2) divide by 8 equally 0
• minus co sinus of e of (x divide by two) divide by eight equally zero
• -cosx/2/8 = 0
• -cos(x divide by 2) divide by 8 = 0

• Similar expressions

• cos(x/2)/8 = 0