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• Identical expressions

• cos(x - pi/ four) = zero
• co sinus of e of (x minus Pi divide by 4) equally 0
• co sinus of e of (x minus Pi divide by four) equally zero
• cosx - pi/4 = 0
• cos(x - pi divide by 4) = 0

• Similar expressions

• cos(x + pi/4) = 0