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Question

If f(x) = sin1(sin x)+cos1(sin x) and ϕ(x)=f(f(f(x))),then ϕ(x) is equal to

A
1
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B
sin x
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C
\N
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D
None of these
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Solution

The correct option is C \N
f(x)=π2(a constant function)
ϕ(x)=0

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