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• Identical expressions

• - two *sin(x - one) = zero
• minus 2 multiply by sinus of (x minus 1) equally 0
• minus two multiply by sinus of (x minus one) equally zero
• -2sin(x - 1) = 0
• -2sinx - 1 = 0

• Similar expressions

• -2*sin(x + 1) = 0
• 2*sin(x - 1) = 0