If \( x=(4+\sqrt{15})^{1 / 3}+(4-\sqrt{15})^{1 / 3} \), then \( x^{3}-3 x \) is equal to(a) 8(b)...
If \( x=(4+\sqrt{15})^{1 / 3}+(4-\sqrt{15})^{1 / 3} \), then \( x^{3}-3 x \) is equal to(a) 8(b) \( -8 \)(c) 4(d) \( -4 \)
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