Answer :

Given |x| ≤ 1


± x ≤ 1


x ≤ 1 or –x ≤ 1


x ≤ 1 or x ≥ -1


x [-1, 1]


Now also given cos (sin-1 x + cos-1 x)


We know that sin-1 x + cos-1 x = π/2


cos (sin-1 x + cos-1 x) = cos (π/2) = 0


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