set terminal png
set output "polar_plot.png"
set polar

set rrange [-3:3]

set title "Polar Function Plot"

# Define the functions
r1(t) = t**2 * sin(t/pi)
r2(t) = 3.75*exp(-t/2.39)

plot r1(t) title "r1(t)" lw 2 lc rgb "red" , \
     r2(t) title "r2(t)" lw 3 lc rgb "blue"