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Find the domain and range of f(x)=sqrt((...

Find the domain and range of `f(x)=sqrt((log)_3{"cos"(sinx)})`

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`f(x)=sqrt(log_(3){cos(sinx)})` ,brgt f(x) is defined only if `log_(3){cos(sinx)} ge 0`
or ` cos (sinx)=1 " as " -1 le cos theta le 1`
or ` sinx =0 " or " x=npi, n in I`
Hence, Domain`={n pi,n in I}`
Also, the range is `{0}`.
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