For 1 ≤ a ≤ 4, find a solution of f(x) = tan(x) + a sin(x)/x = 0 using Newton’s method. Plot the solution as a function of a. Please help me to solve it by matlab.

[Walter Roberson]

What is your question?

[Chun Kit NG]

using matlab to sovle f(x) and plot the graph.

[Jan]

@Chun Kit NG: This is the original question. Now what is your question? The forum will not solve your homework. To show, what you have done so far and ask a specific question.

[Chun Kit NG]

I don't know what is Newton's method and how to write the equation f(x)=tan(x)+asin(x)/x.

[Jan]

"write the equation f(x)=tan(x)+asin(x)/x"

f = @(x) tan(x) + a * sin(x) / x;

Please ask your teacher or read in the book used for the lessons, what the Newton method is. Even WikiPedia explains this exhaustively.

This is a Matlab forum. Asking in a forum cannot replace learning numerical maths.

[James Tursa]

E.g., see the algorithm here: https://en.wikipedia.org/wiki/Newton's_method