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• Identical expressions

• -sin(x + pi/ three) = zero
• minus sinus of (x plus Pi divide by 3) equally 0
• minus sinus of (x plus Pi divide by three) equally zero
• -sinx + pi/3 = 0
• -sin(x + pi divide by 3) = 0

• Similar expressions

• -sin(x - pi/3) = 0
• sin(x + pi/3) = 0