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• Identical expressions

• (sin(x) + four *sin(two *x)) = zero
• ( sinus of (x) plus 4 multiply by sinus of (2 multiply by x)) equally 0
• ( sinus of (x) plus four multiply by sinus of (two multiply by x)) equally zero
• (sin(x) + 4sin(2x)) = 0
• sinx + 4sin2x = 0

• Similar expressions

• (sin(x) - 4*sin(2*x)) = 0
• (sinx + 4*sin(2*x)) = 0