I ran into a small problem that i couldn't figure out.
so if cos x = integral of - sin x = integral - ( x - (x^3/3!) + (x^5/5!) - (x^7/7!) + ... )
then cos x = - x^2 / 2! + x^4 / 4! - x^6/6! + x^8/8!
But we know that cos x is actually equal to 1 - x^2/2! + x^4/4! - ...... etc
So my question is what did i do wrong? How come i am missing an one.
so if cos x = integral of - sin x = integral - ( x - (x^3/3!) + (x^5/5!) - (x^7/7!) + ... )
then cos x = - x^2 / 2! + x^4 / 4! - x^6/6! + x^8/8!
But we know that cos x is actually equal to 1 - x^2/2! + x^4/4! - ...... etc
So my question is what did i do wrong? How come i am missing an one.
