For 3rd answer should be (a) bcz gof (x)=0 for all x € R.
For 4th, you basically have to check LHLs and RHLs at suspicious points i.e where f changes it's definition (and others).
So, at x=1,
LHL = -1
RHL = 0
Is 5 answer Is d??
Isn't it b
Wait i am trying to solve 5
Remarks at x=3 g(3)=-1 but fog(×) at x=-3 is
f(-1) BUT f(-1) not defined in question so option d is correct
Because other option contain x=3