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      1 tree=(+ (+ (+ (+ (+ (+ (* 2 (^ x 3)) (^ x 5)) (* 4 x)) (* 10 x)) (* 8 x)) x) 2)
      2 d/dx=(+ (+ (+ (+ (+ (+ (* 6 (^ x 2)) (* 5 (^ x 4))) 4) 10) 8) 1) 0)
      3 simplified=(+ (+ (+ (+ (* 6 (^ x 2)) (* 5 (^ x 4))) 4) 18) 1)
      4 6x^2+5x^4+4+18+1
      5