The expression `1/(1+x/(1-x/(x+2)))-: (1/(1-x)+1/(1+x))/(1/(1-x)-1/(1+x))`

The expression (1)/(1+(x)/(1-(x)/(x+2)))div ((1)/(1-x)+(1)/(1+x))/((1)/(1-x)-(1)/(1+x)) (a) (2x)/(x^(2)+2x+2) (b) (2x)/(x^(2)-1) (c) 1 (d) x^(2)-1

The expressin (1)/(1+(x)/(1-(x)/(x+2)))div ((1)/(1-x)+(1)/(1+x))/((1)/(1-x)-(1)/(1+x))

For x!=0,+-1, the expression (((1)/(x^(2007))-(1)/(x^(2009)))/((1)/(x^(2008))-(1)/(x^(2010)))) is

Expression ((a+1/b)^(1/x)(a-1/b)^(1/x))/((b+1/a)^(1/x)(b-1/a)^(1/x)) is an integer if

Expression ((a+1/b)^(1/x)*(a-1/b)^(1/x))/((b+1/a)^(1/x)*(b-1/a)^(1/x)) is an integer if

(1+(1)/(x))(1+(1)/(x+1))(1+(1)/(x+2))(1+(1)/(x+3))

Sum to n terms of the series (1)/((1+x)(1+2x))+(1)/((1+2x)(1+3x))+(1)/((1+3x)(1+4x))+ is (i) (1+x)(1+nx)((1+x)(1+nx))/((1+x)(1+(n-1)x))( iv )((1+x)(1+(n+1)x))/((1+x)(1+(n+1)x))

The expression (1)/(x-1)-(1)/(x+1)-(2)/(x^(2)+1)-(4)/(x^(4)+1) is equal to (8)/(x^(8)+1)( b) (8)/(x^(8)-1)( c) (8)/(x^(7)-1) (d) (8)/(x^(7)+1)