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a [tex]\sqrt{x-1}[/tex] in powers of x

b [tex]\sqrt{x+1}[/tex] in powers of x

c [tex]ln(x)[/tex] in powers of (x-1)

d [tex]tanx[/tex] in powers of (x-\pi / 4 )

e [tex]ln(1-x)[/tex] in powers of x

What are htey asking and how do i do this? the answer is A by the way