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प्रश्न
Find the domain of `f(x)=cos^-1x+cosx.`
उत्तर
For `cos^-1x` to be defined.
`-1<=x<=1`
Now, cosx is defined for all real values.
So, domain of cosx is R.
Domain of `f(x) is R cap[-1,1]=[-1,1]`.
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