Where do sin and cos come from.
I use them on my caluclator but I never really understand where they are getting the number from. My teacher keeps mentioning that when he was a student a hundred years ago they had to look up all of the values in a book.
so where do the values come from. could I derive them myself?
For sure!Originally Posted by Math Dude
There are formulas that do the work very well, but are quite difficult to explain expecially if you have not studied calculus.
The name is Taylor's formula
But here is an example
Be sure that your calculator shows RAD and calculate sin(0.1)
you get something like
Now try with this:
x - x^3/6
if you put 0.1 = 1/10 in place of x you get
1/10 -1/6000 ~ 0.09983333333
how many decimal digit are correct? Six!
Better results (and longer calculation) are obtained if you use
x^5/120 - x^3/6 + x
0.1^5/120 - 0.1^3/6 + 0.1 ~ 0.09983341666
Ten decimal digits are correct!
They are long calculation to be made by hand, aren't they?
Once matematicians made all by hand. Look at you calculator with more respect from now on