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• Identical expressions

• two *sin(x + pi/ four) = zero
• 2 multiply by sinus of (x plus Pi divide by 4) equally 0
• two multiply by sinus of (x plus Pi divide by four) equally zero
• 2sin(x + pi/4) = 0
• 2sinx + pi/4 = 0
• 2*sin(x + pi divide by 4) = 0

• Similar expressions

• 2*sin(x - pi/4) = 0