Q. 505.0( 2 Votes )
Mark the correct A. 
B. 
C. does not exist
D. none of these
Answer :
Given that f: R → R be given by f(x) = tan x
For f–1:
y = f(x)
⇒ y = tan x
⇒ x = tan-1 y
f–1 = tan-1 x
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