Cody

Problem 44492. Approximate the cosine function

Solution 2091005

Submitted on 13 Jan 2020 by ariel afriat
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Test Suite

Test Status Code Input and Output
1   Pass
filetext = fileread('myCos.m'); assert(isempty(strfind(filetext, 'regexp')),'regexp hacks are forbidden')

2   Pass
filetext = fileread('myCos.m'); trigUsed = any(strfind(filetext, 'cos')) || any(strfind(filetext, 'sin')) ||... any(strfind(filetext, 'exp')); assert(~trigUsed, 'Cannot use MATLAB trigonometric functions')

3   Pass
x = 0; assert(abs(myCos(x)-cos(x)) < 0.0001)

a = 1 a = 0 y = 1

4   Pass
x = pi; assert(abs(myCos(x)-cos(x)) < 0.0001)

a = 1 a = -4.9348 a = 4.0587 a = -1.3353 a = 0.2353 a = -0.0258 a = 0.0019 a = -1.0464e-04 a = 4.3031e-06 y = -1.0000

5   Pass
x = pi/2; assert(abs(myCos(x)-cos(x)) < 0.0001)

a = 1 a = -1.2337 a = 0.2537 a = -0.0209 a = 9.1926e-04 a = -2.5202e-05 y = -4.6477e-07

6   Pass
x = 5*pi/3; assert(abs(myCos(x)-cos(x)) < 0.0001)

a = 1 a = -13.7078 a = 31.3172 a = -28.6193 a = 14.0110 a = -4.2680 a = 0.8864 a = -0.1335 a = 0.0153 a = -0.0014 a = 9.8593e-05 y = 0.5000