Which of the following functions is/are ...

Which of the following functions is/are discontinuous at `x=1?` `f(x)=1/(1+2^(t a n x))` `g(x)=(lim)_(xvecoo)1/(1+n in s^2(pix))` `h(x)=2^-2^(((1/(1-x)))),x!=1a n dh(1)=1` `varphi(x)=(x-1)/(|x-1|+2(x-1)^2),x!=1a n dvarphi(1)=1`

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