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**furor celtica** For each of the following functions, sketch the graph of y=f^-1(x)

f(x)=sinx°, x ϵ R and -90≈x≈90

f(x)=cosx°, x ϵ R and 0≈x≈180

f(x)=tanx°, x ϵ R and -90<x<90

To be honest I have no frigging idea what to make of the domains of the sine and cosine functions, are they typos? “x approximately equal to plus or minus 90”, what the heck is that for a domain? On the other hand the domain of the tangent function is perfectly normal, and what you would expect for the first two.

Are these just a typo from my textbook?