Cody

# Problem 44492. Approximate the cosine function

Solution 1493446

Submitted on 16 Apr 2018 by bainhome
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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)

ans = function_handle with value: @(n,x)sum((-1).^n.*(x).^(2*n)./factorial(2*n))

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

ans = function_handle with value: @(n,x)sum((-1).^n.*(x).^(2*n)./factorial(2*n))

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

ans = function_handle with value: @(n,x)sum((-1).^n.*(x).^(2*n)./factorial(2*n))

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

ans = function_handle with value: @(n,x)sum((-1).^n.*(x).^(2*n)./factorial(2*n))

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