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• Identical expressions

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

• Similar expressions

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