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圖形計算器
繪製函數、點、不等式
免費的線上二維繪圖計算器（繪圖器），亦即曲線計算器，可繪製分段函數、線性函數、二次函數、三次函數、四次函數、多項式函數、三角函數、雙曲函數、指數函數、對數函數、反函數，並支援不同表示形式：顯式、隱式、極座標與參數式。它還可以繪製圓錐曲線、任意不等式或不等式組、斜率場（向量場或方向場），並可視化黎曼和。圖形可依需求設定樣式並加以自訂。
To draw a parabola, circle, ellipse or hyperbola, choose the "Implicit" option.
You can pass a function as a parameter: https://www.emathhelp.net/zh-hant/calculators/calculus-1/online-graphing-calculator/?y=sin(x)&y=cos(x) will draw y=sin(x) and y=cos(x).
相關計算器: 3D 圖形計算器
Pan the graph (move it) by holding the Shift key and dragging the graph with the mouse.
Zoom the graph in and out by holding the Shift key and using the mouse wheel.
The above operations can be very slow for more than 2 graphs. To avoid it, delete all graphs, pan and zoom, and then plot the graphs again.