摘要： \begin{tikzpicture}[scale=1.6]\def\iangle{120}\begin{scope}[xshift=-2cm]\draw[->] (-1.2,0) --(1.2,0);\draw[->] (0,-1.2) --(0,1.2);\draw[thick] (0,0) circle(1cm);\coordinate [label = \iangle:$P$] (P) at (\iangle:1);\coordinate [label = below:$P0$] (P0) at (P |-0,0);\draw (P)--(P0);\draw (0,0)-- 阅读全文

摘要： \begin{tikzpicture}[scale=0.8,thick]\def\a{5}%长半轴\def\b{3}%短半轴\def\c{4}%焦半轴\def\ptsize{2.0pt} %点的半径%x 轴 和 y轴 \path[name path=xaxis,thick,draw,->](-6,0)--(6,0) node[right] {$x$};\path[name path=yaxis,thick,draw,->](0,-6)--(0,6) node[above,right] {$y$};%x 轴 与 y 轴的交点 \path [name intersections={of 阅读全文

摘要： \begin{tikzpicture}[scale=0.7]\draw[->,very thick] (-5,0) --(5,0) node[right]{$x$};\draw[->,very thick] (0,-3) --(0,5);\draw[very thick ] (-3,3) parabola bend (0,-1) (3,3);\draw node [below left] at (0,-1) {\textcircled{$1$}};\foreach \x/\xtext in {-3/$m$,3/$n$}\draw[shift={(\x,0)},very thick] 阅读全文