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Piyush pachauri Best Answer
Please find attached
doubt
yes
infinitely diffrentiable
then what do we meean when we say twice differentiable functions?
second derivative exist ,third may or may not.
please give an example.
Take x^2×|x|
it is not differentiable at x=0? elsewhere it is differentiable infinitely.
It's third derivative doesn't exist at x=0 , so not differentiable