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• Identical expressions

• - four *(x*cos(two *x) + sin(two *x)) = zero
• minus 4 multiply by (x multiply by co sinus of e of (2 multiply by x) plus sinus of (2 multiply by x)) equally 0
• minus four multiply by (x multiply by co sinus of e of (two multiply by x) plus sinus of (two multiply by x)) equally zero
• -4(xcos(2x) + sin(2x)) = 0
• -4xcos2x + sin2x = 0

• Similar expressions

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