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Solution

The inverse of function f:AB exists if f is one-one onto i.e.,

y=f( x ) f 1 ( y )=x .

The given inverse trigonometry function is sin 1 ( 1 2 ) .

Let

sin 1 ( 1 2 )=y ,

siny= 1 2 =sin( π 6 )

Since, the range of the principle value of sin 1 ( x ) ( π 2 , π 2 ) .

π 6 ( π 2 , π 2 )

Thus, the principle value of sin 1 ( 1 2 ) is π 6 .


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