(d) None of these 12. Given a real-valued function f such that tanx} (x- [x) 1 (2 2, , for x>0 for x = 0 V{xcot{«} , for x <0 fx)= where x] is the integral part

(d) None of these 12. Given a real-valued function f such that tanx} (x- [x) 1 (2 2, , for x>0 for x = 0 V{xcot{«} , for x <0 fx)= where x] is the integral part and {x} is the fractional part of x, then (a) lim fx) =1 (b) lim f(x) = cotl 0 )=] x0 lim flx)= cot 1 (c) x-0 (d) None of these 13/f y then (1-x)is equal to dx 1+x (d) - 2 (c)- (b) cien Tvn mnroho