Question 1160369
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Find a root of an equation f(x)=2coshxsinx-1 taking initial value x0=0.4, 
using Newton Raphson method correct up to four decimal places.
Do all the calculations.
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As I read this post,  I clearly see that it is created by a person, 
who is unfamiliar with standard mathematical terminology.



        Why ? - - - Because there is  NO  any equation in this post.



What you call  " an equation ",  is  NOT  an equation. 


It is the definition of function  f(x).


Therefore,  the post needs to be re-formulated.