# 1. The Taylor series for sin x is sin x = x − x3 3! + x5 5...

## Transcribed Text

1. The Taylor series for sin x is sin x = x − x3 3! + x5 5! − x7 7! + ··· . Plot P3(x) = x − x3 3! and P5(x) = x − x3 3! + x5 5! on the same graph on [−5, 5] range. Graph should be in different colors and also include title, x-label, y-label, and legend.(see MATLAB notes on Isidore) 2. Since f′ (x0) ≈ f(x0 + h) − f(x0) h . Consider f(x) = sin x, x0 = 1.2,fp = cos(1.2), hence cos(x0) ≈ sin(x0 + h) − f(x0) h . Use MATLAB to construct a table of values of difference quotient with decreasing h values. We hope that with decreasing h the error will become smaller and smaller. After completing table what do you notice? Explain. h Absolute error 0.1 0.01 0.001 1e − 4 1e − 5 1e − 6 1e − 7 1e − 8 1e − 9 1e − 10 1e − 11 1e − 13 1e − 15 1e − 16 3 Use Matlab to • Type the following script and run it to get a plot. The plot shows the random nature of roundoff error. t=0:0.002:1; tt=exp(-t).*(sin(2*pi*t)+2); rt=single(tt) round_err=(tt-rt)./tt; plot(t,round_err,’-b’); title(’error in sampling exp(-t)(sin(2\pi t)+2) single precision’) xlabel(’t’) ylabel(’roundoff error’) %relative error is about eps(single)/2 rel_round_err=max(abs(round_err))/(eps(’single’)/2)

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%Question 1
x=-5:0.1:5;%increments of 0.1
P3=x-x.^3/factorial(3);
P5=x-x.^3/factorial(3)+x.^5/factorial(5);
figure(1);
plot(x,P3,x,P5);
xlabel('x');
ylabel('y');
legend('P3','P5');...

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