It's interesting, thanks!
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To graph any function just randomly put different numeric values and plot them in graph.
For ex. f(x)= 2x+5 F(2)=9 F(5)=15 Plot them you will get an idea to plot graph. Another ex. f(x)=sinx. f(π/2)=1. f(0)=0. Plot these values and you will get the answer