Evaluate each of the following:

sin–1(sin4)

sin–1(sin x) = x


Provided x ϵ ≈ [–1.57,1.57]


And in our equation x is 4 which does not lie in the above range.


We know sin[π – x] = sin[–x]


sin(π – 4) = sin(–4)


Also π–4 belongs in


sin–1(sin 4) = π – 4


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