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If the domain of the function f(x) = \sin^-1 \left( 1/x^2 - 2x - 2 \right) , is (-\infty, α] \cup [β, γ] \cup [\delta, \infty) , then α + β + γ + \delta is equal to | Watch the step-by-step video solution for this NIMCET PYQ.