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• Identical expressions

• -sin(x/ two)/ two = zero
• minus sinus of (x divide by 2) divide by 2 equally 0
• minus sinus of (x divide by two) divide by two equally zero
• -sinx/2/2 = 0
• -sin(x divide by 2) divide by 2 = 0

• Similar expressions

• sin(x/2)/2 = 0