{
  "index": "1998-B-1",
  "type": "ALG",
  "tag": [
    "ALG"
  ],
  "difficulty": "",
  "question": "Find the minimum value of\n\\[\\frac{(x+1/x)^6-(x^6+1/x^6)-2}{(x+1/x)^3+(x^3+1/x^3)}\\]\nfor $x>0$.",
  "solution": "Notice that\n\\begin{gather*}\n\\frac{(x+1/x)^6-(x^6+1/x^6)-2}{(x+1/x)^3+(x^3+1/x^3)} = \\\\\n(x+1/x)^3-(x^3+1/x^3)=3(x+1/x)\n\\end{gather*}\n(difference of squares).  The latter is easily seen\n(e.g., by AM-GM) to have minimum value 6\n(achieved at $x=1$).",
  "vars": [
    "x"
  ],
  "params": [],
  "sci_consts": [],
  "variants": {
    "descriptive_long": {
      "map": {
        "x": "positivex"
      },
      "question": "Find the minimum value of\n\\[\\frac{(\\positivex+1/\\positivex)^6-(\\positivex^6+1/\\positivex^6)-2}{(\\positivex+1/\\positivex)^3+(\\positivex^3+1/\\positivex^3)}\\]\nfor $\\positivex>0$.",
      "solution": "Notice that\n\\begin{gather*}\n\\frac{(\\positivex+1/\\positivex)^6-(\\positivex^6+1/\\positivex^6)-2}{(\\positivex+1/\\positivex)^3+(\\positivex^3+1/\\positivex^3)} = \\\\\n(\\positivex+1/\\positivex)^3-(\\positivex^3+1/\\positivex^3)=3(\\positivex+1/\\positivex)\n\\end{gather*}\n(difference of squares).  The latter is easily seen\n(e.g., by AM-GM) to have minimum value 6\n(achieved at $\\positivex=1$)."
    },
    "descriptive_long_confusing": {
      "map": {
        "x": "candlewax"
      },
      "question": "Find the minimum value of\n\\[\\frac{(candlewax+1/candlewax)^6-(candlewax^6+1/candlewax^6)-2}{(candlewax+1/candlewax)^3+(candlewax^3+1/candlewax^3)}\\]\nfor $candlewax>0$.",
      "solution": "Notice that\n\\begin{gather*}\n\\frac{(candlewax+1/candlewax)^6-(candlewax^6+1/candlewax^6)-2}{(candlewax+1/candlewax)^3+(candlewax^3+1/candlewax^3)} = \\\\\n(candlewax+1/candlewax)^3-(candlewax^3+1/candlewax^3)=3(candlewax+1/candlewax)\n\\end{gather*}\n(difference of squares).  The latter is easily seen\n(e.g., by AM-GM) to have minimum value 6\n(achieved at $candlewax=1$)."
    },
    "descriptive_long_misleading": {
      "map": {
        "x": "constantvalue"
      },
      "question": "Find the minimum value of\n\\[\\frac{(constantvalue+1/constantvalue)^6-(constantvalue^6+1/constantvalue^6)-2}{(constantvalue+1/constantvalue)^3+(constantvalue^3+1/constantvalue^3)}\\]\nfor $constantvalue>0$.",
      "solution": "Notice that\n\\begin{gather*}\n\\frac{(constantvalue+1/constantvalue)^6-(constantvalue^6+1/constantvalue^6)-2}{(constantvalue+1/constantvalue)^3+(constantvalue^3+1/constantvalue^3)} = \\\\\n(constantvalue+1/constantvalue)^3-(constantvalue^3+1/constantvalue^3)=3(constantvalue+1/constantvalue)\n\\end{gather*}\n(difference of squares).  The latter is easily seen\n(e.g., by AM-GM) to have minimum value 6\n(achieved at $constantvalue=1$)."
    },
    "garbled_string": {
      "map": {
        "x": "qzxwvtnp"
      },
      "question": "Find the minimum value of\n\\[\\frac{(qzxwvtnp+1/qzxwvtnp)^6-(qzxwvtnp^6+1/qzxwvtnp^6)-2}{(qzxwvtnp+1/qzxwvtnp)^3+(qzxwvtnp^3+1/qzxwvtnp^3)}\\]\nfor $qzxwvtnp>0$.",
      "solution": "Notice that\n\\begin{gather*}\n\\frac{(qzxwvtnp+1/qzxwvtnp)^6-(qzxwvtnp^6+1/qzxwvtnp^6)-2}{(qzxwvtnp+1/qzxwvtnp)^3+(qzxwvtnp^3+1/qzxwvtnp^3)} = \\\\\n(qzxwvtnp+1/qzxwvtnp)^3-(qzxwvtnp^3+1/qzxwvtnp^3)=3(qzxwvtnp+1/qzxwvtnp)\n\\end{gather*}\n(difference of squares).  The latter is easily seen\n(e.g., by AM-GM) to have minimum value 6\n(achieved at $qzxwvtnp=1$)."
    },
    "kernel_variant": {
      "question": "For every real \\(t>0\\) find the minimum of  \n\\[\n\\frac{(t+1/t)^{8}\\;-\\bigl(t^{4}+1/t^{4}\\bigr)^{2}}\n     {(t+1/t)^{4}+\\bigl(t^{4}+1/t^{4}\\bigr)}.\n\\]",
      "solution": "Set  \n\\(A=(t+1/t)^{4},\\;B=t^{4}+1/t^{4}\\).  \nBecause \\((t^{4}+1/t^{4})^{2}=t^{8}+1/t^{8}+2\\) we have  \n\\(A^{2}-B^{2}=(t+1/t)^{8}-(t^{4}+1/t^{4})^{2}\\).  \nThus\n\\[\n\\frac{A^{2}-B^{2}}{A+B}=A-B.\n\\]\nNow  \n\\[\nA-B=(t+1/t)^{4}-\\bigl(t^{4}+1/t^{4}\\bigr)\n     =4\\Bigl(t^{2}+\\frac1{t^{2}}\\Bigr)+6.\n\\]\nBy AM–GM, \\(t^{2}+1/t^{2}\\ge2\\), so \\(A-B\\ge4\\cdot2+6=14\\);  \nequality occurs at \\(t=1\\).  \nHence the required minimum is \\(\\boxed{14}\\).",
      "_replacement_note": {
        "replaced_at": "2025-07-05T22:17:12.124399",
        "reason": "Original kernel variant was too easy compared to the original problem"
      }
    }
  },
  "checked": true,
  "problem_type": "calculation"
}