Required Matlab code with explanatory comments is given below:
x=[1,0.7];
f=@(x) exp(-x)-tan(x);
for k=1:3 %3 iterations
x(k+2)=(x(k)*f(x(k+1))-x(k+1)*f(x(k)))/(f(x(k+1))-f(x(k))); %secant
method
end
display(x(end));
And the output:
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