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clc;clear
syms x y t real
x = cos(t)/(2+sin(t));
y = 3+sin(2*t)-2*(sin(t))^2;
dxdt = diff(x,t);
dydt = diff(y,t);
dydx = dydt/dxdt;
dxdy = dxdt/dydt;
tx0 = (solve(dydx,t))
tx0 = mod(tx0,2*pi);
ymaxymin = subs(y,t,tx0);
eval(ymaxymin)
y0 = solve(dxdy,t);
xminxmax = subs(x,t,y0);
eval(xminxmax)
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