Why does this SIMPLE code not work
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Moe_2015 on 25 May 2017
In the last line, you are just printing to the screen the result you got in the 2nd line. If you want f1 to be calculated again you need to do so.
x = 1.5
f1= sin(x) + x*cos(x)
f2 = 2*cos(x)-x*sin(x)
x = x - (f1/f2)
f1_new = sin(x) + x*cos(x) % renamed so you can see that it is different than the original f1.