t=-pi/2:0.01:pi/2;
x=atan((2*(cos(t)-cos(pi/4)*sin(t)))./(2*(cos(t)-cos(pi/4)).*cos(t)+1));
plot(t,x)
matlab 中如何根据这个函数 tanx=(2(cost-cos(pi/4)*sin(t)) /(2(cost-cos
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