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• Identical expressions

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

• Similar expressions

• sin(x)/2 = 0
• -sinx/2 = 0