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Questions  

 If f(x)=2x+|x|,g(x)=13(2x|x|) and h(x)=f(g(x)) then domain of sin1(h(h(h(hh(x)))))n times  is 

a
[−1,1]
b
−1,−12∪12,1
c
−1,−12
d
12,1

detailed solution

Correct option is A

fx = 2x+x, x≥0              =2x-x, x<0        then  fx=3x ,x≥0         =x, x<0  gx= 132x-x, if x≥0         =132x+x,x<0               ⇒   gx=x3 , x≥0                =x,x<0 therefore fgx=3x3 = x,  if x≥0                           = x          , if x<0         ⇒  hx =x , for all x∈R sin-1hhh......hx.....=sin-1x     , it's domain is=[-1,1]

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