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If f(x)={{:(x^2,"for " x ge 0),(x,"for "...

If `f(x)={{:(x^2,"for " x ge 0),(x,"for " x lt 0):}` then fof (x) is given by

A

a) `x^2" for " xge0 , x " for " x lt 0`

B

b) `x^4" for " xge0 ,x^2 " for " x lt 0`

C

c) `x^4" for " xge0 ,-x^2 " for " x lt 0`

D

d) `x^4" for " xge0 ,x " for " x lt 0`

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The correct Answer is:
D
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