Khan Academy on a Stick
Cosine Taylor Series at 0 (Maclaurin)
Approximating f(x)=cos x using a Maclauren Series (special case of a Taylor series at x=0)
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Approximating f(x)=cos x using a Maclauren Series (special case of a Taylor series at x=0)
If the above player doesn't work, you can try this direct link.