Which of the following function is an into function in the codomain of all real numbers ?
f(x)= tan x
f(x) = cot x
f(x) = lnx
As we have learned
Into function -
If function AB is such that there is atleast one element in B which is not f image of any element in A.
- wherein
Range of f is proper subset of Co - domain of f
Domain of this function = R
co domain = R ; but range =
Thus it is an onto funtion
Option 1)
f(x)= tan x
Option 2)
f(x) = cot x
Option 3)
Option 4)
f(x) = lnx
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