Find the domain of the function f(x) = cos-1[2x2 -3]

fx=cos-12x2-3We know domain of cos-1x is -1,1So,-12x2-31-1+32x2-3+31+322x241x22So,x-1 , x1 and x-2 , x2So, domain is -2,-11,2 .

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