Question: How to write greek letters along with english letters in text plot

Greetings,

help 

i want to add text with greek letters and english letters on top of the graph with out using title in plot

 

restart:
with(plots):
p1:=plot(sin(2*x), x = -Pi .. Pi):
p2:= textplot(effect of alpha =3,gamma=5 in the flow):
display(p1,p2):
 

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