R.H.L.=x→4+lim[x]−[4x]=4−1=3
L.H.L.=x→4−lim[x]−[4x]=3−0=3
f(x)=4−1=3
L.H.L.=f(4)=R.H.L.
Hence, given function is continuous at x=4.
JEE Main 2019 — Mathematics Calculus
If f(x)=[x]−[4x],x∈R, where [x] denotes the greatest integer function, then:
Held on 9 Apr 2019 · Verified 6 Jul 2026.
x→4+limf(x) exists but x→4−limf(x) does not exist
f is continuous at x=4
x→4−limf(x) exists but x→4+limf(x) does not exist
Both x→4−limf(x) and x→4+limf(x) exist but are not equal
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