Asked by mathstudent

limit (x -> 0): (cos x - 1) / x

The answer is 0. I can see this with graphing calculator, but how do I solve algebraically?

Answers

Answered by bobpursley
For cosine of x, change it to the infinite series, then divide by x, and you have it.

http://www.ucl.ac.uk/Mathematics/geomath/level2/series/ser11.html
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