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• Identical expressions

• - two *x*sin(two *x) - cos(two *x) = zero
• minus 2 multiply by x multiply by sinus of (2 multiply by x) minus co sinus of e of (2 multiply by x) equally 0
• minus two multiply by x multiply by sinus of (two multiply by x) minus co sinus of e of (two multiply by x) equally zero
• -2xsin(2x) - cos(2x) = 0
• -2xsin2x - cos2x = 0

• Similar expressions

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