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• Identical expressions

• two *cos(x - pi/ two) = zero
• 2 multiply by co sinus of e of (x minus Pi divide by 2) equally 0
• two multiply by co sinus of e of (x minus Pi divide by two) equally zero
• 2cos(x - pi/2) = 0
• 2cosx - pi/2 = 0
• 2*cos(x - pi divide by 2) = 0

• Similar expressions

• 2*cos(x + pi/2) = 0