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• Identical expressions

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

• Similar expressions

• 2*cos(x) = 0
• -2*cosx = 0