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• Identical expressions

• cos(x) + two *cos(two *x) = zero
• co sinus of e of (x) plus 2 multiply by co sinus of e of (2 multiply by x) equally 0
• co sinus of e of (x) plus two multiply by co sinus of e of (two multiply by x) equally zero
• cos(x) + 2cos(2x) = 0
• cosx + 2cos2x = 0

• Similar expressions

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