1+x+x^2/2! +x^3/3! +……+x^n/n! +……
ln( 1+x)=x-x^2/2+x^3/3-……+(- 1)^(k- 1)*(x^k)/k(|x|<; 1)
sin x =
x-x^3/3! +x^5/5! -……+(- 1)^(k- 1)*(x^(2k- 1))/(2k- 1)! +………(-∞& lt; x & lt∞)
cos x =
1-x^2/2! +x^4/4! -……+(- 1)k*(x^(2k))/(2k)! +……(-∞& lt; x & lt∞)
tanx=x+x^3/3+2x^5/ 15+ 17x^7/3 15+62x^9/2835++[2^(2n)*(2^(2n)- 1)*b(2n- 1)*x^(2n- 1)]/(2n)! +.(| x | & ltπ/2)
arcsin x = x+ 1/2*x^3/3+ 1*3/(2*4)*x^5/5+
……(| x | & lt; 1)
arccos x
=π-(x+ 1/2*x^3/3+ 1*3/(2*4)*x^5/5+……)(| x | & lt; 1)
arctan x = x - x^3/3 +
x^5/5 -……(x≤ 1)
sh x = x+x^3/3! +x^5/5! +……+(- 1)^(k- 1)*(x^2k- 1)/(2k- 1)! +……
(-∞& lt; x & lt∞)
ch x =
1+x^2/2! +x^4/4! +……+(- 1)k*(x^2k)/(2k)! +……(-∞& lt; x & lt∞)
arcsh x = x- 1/2*x^3/3+ 1*3/(2*4)*x^5/5-……
(| x | & lt 1)
arcth x = x+x^3/3+x^5/5+……(| x | & lt; 1)