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图形计算器
绘制函数、点、不等式
免费的在线二维图形计算器（绘图器）或曲线计算器，能够绘制分段函数、线性函数、二次函数、三次函数、四次函数、多项式函数、三角函数、双曲函数、指数函数、对数函数、反函数，并支持显式、隐式、极坐标和参数形式。它还可以绘制圆锥曲线、任意不等式或不等式组、斜率场（向量场或方向场），并可视化黎曼和。绘图可按需设置样式并自定义。
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-hans/calculators/calculus-1/online-graphing-calculator/?y=sin(x)&y=cos(x) will draw y=sin(x) and y=cos(x).
相关计算器: 三维图形计算器
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.