Q 1234880752.     If `y = 1/(t^2+t−2)` where `t = 1/(x−1)`, then the number of points of discontinuities of `y = f(x), x ∈ R` is

A

`0`

B

`2`

C

`1`

D

`3`

HINT

discontinuous mean the function is not defined
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