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sine to cosine

 
Greenhorn
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is there an easy way to calculate cosine by changing this code of sine?

sine.png
[Thumbnail for sine.png]
 
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Welcome to the Ranch

Please post the code as text and use the code button; your screenshot is illegible.
 
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Just change n to 0 in line 28. See the power series of cos and sin as to why this works.

Check that the methods 'factorial' and 'power' also work when the argument is 0.

Note that the method can be made much more efficient.

 
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