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Question

If f(x) is an odd function then cosf(x) is
  1. odd
  2. even
  3. neither even nor odd
  4. a constant function

A
even
B
neither even nor odd
C
a constant function
D
odd
Solution
Verified by Toppr

f(x) is an odd function
So, f(x)=f(x)
F(x)=cos(f(x))
=cos(f(x))
=cos(f(x))
=F(x)
So cos(f(x)) is an even function

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