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Duy Hà
<10
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html
<!DOCTYPE html>
<html lang="vi">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Đồ Thị Hàm Số</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <h1>Đồ Thị Hàm Số</h1>
  <div id="controls">
    <input type="text" id="expressionInput" placeholder="Nhập hàm số, ví dụ: (2*x-1)/(x+2)">
    <button id="drawButton">Thêm Đồ Thị</button>
    <button id="resetButton">Reset</button>
    <label>
      Màu Đồ Thị:
      <input type="color" id="colorPicker" value="#4a90e2">
    </label>
    <label>
      Hiển Thị Lưới:
      <input type="checkbox" id="gridToggle" checked>
    </label>
    <button id="saveButton">Lưu Kết Quả</button> <!-- Nút lưu ảnh -->
  </div>
  <div id="canvasContainer">
    <canvas id="canvas" width="800" height="600"></canvas>
  </div>
  <h3>Hướng Dẫn Nhập</h3>
  <div id="description">
    <table>
      <tr>
        <th>Phép Toán</th>
        <th>Ký Hiệu</th>
      </tr>
      <tr>
        <td>Mũ</td>
        <td><code>**</code></td>
      </tr>
      <tr>
        <td>Nhân</td>
        <td><code>*</code></td>
      </tr>
      <tr>
        <td>Chia</td>
        <td><code>/</code></td>
      </tr>
      <tr>
        <td>Cộng</td>
        <td><code>+</code></td>
      </tr>
      <tr>
        <td>Trừ</td>
        <td><code>-</code></td>
      </tr>
      <tr>
        <td>Sin</td>
        <td><code>sin(x)</code></td>
      </tr>
      <tr>
        <td>Cos</td>
        <td><code>cos(x)</code></td>
      </tr>
      <tr>
        <td>Tan</td>
        <td><code>tan(x)</code></td>
      </tr>
      <tr>
        <td>Căn Bậc Hai</td>
        <td><code>sqrt(x)</code></td>
      </tr>
      <tr>
        <td>Hàm mũ</td>
        <td><code>exp(x)</code></td>
      </tr>
    </table>
  </div>
  <script src="script.js"></script>
</body>
</html>
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