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Find k if fog=gof where f(x)=2x+1, g(x)=...

Find `k` if `fog=gof` where `f(x)=2x+1`, `g(x)=x+k`.

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The correct Answer is:
`drarrs`
`drarrs`
`f(x)=5/4-(sinx-1)^(2)`
Maximum value occurs when sinx =`1/2`
`f(X) gt0 if cos x gt sinx`
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