Problem 44492. Approximate the cosine function

Solution 1413817

Submitted on 11 Jan 2018 by David Verrelli

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James on 15 Jun 2018

The hard way to go about it, but it worked like a charm!

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) y = 0.9999
4	Pass	x = pi; assert(abs(myCos(x)-cos(x)) < 0.0001) y = -1.0000
5	Pass	x = pi/2; assert(abs(myCos(x)-cos(x)) < 0.0001) y = -1.0289e-08
6	Pass	x = 5*pi/3; assert(abs(myCos(x)-cos(x)) < 0.0001) y = 0.5000