❤️Math Follow Me and Practice everyday 💯
🤔️跟我一起做💯
🌹Topic today：
🔑Key words：Length of the Curve，Arc Length用定積分求曲線弧長
▶️ derivative導數，continuous連續，interval區間
▶️ curve defined parametrically by the equation用參數方程定義的曲線
▶️position位置，distance the particle travels粒子運動的距離
