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• Identical expressions

• cos(x + pi/ six) = zero
• co sinus of e of (x plus Pi divide by 6) equally 0
• co sinus of e of (x plus Pi divide by six) equally zero
• cosx + pi/6 = 0
• cos(x + pi divide by 6) = 0

• Similar expressions

• cos(x - pi/6) = 0