Mathematics

Mathematics

Problem

Consider the curve given by x=t3−3tx=t^{3}-3t and y=t4−4t2y=t^{4}-4t^{2} for all real tt. For which values of tt is yy decreasing with respect to xx? a) (−∞,−2)∪(1,2)(-\infty,-\sqrt{2})\cup(1,\sqrt{2}) b) (−2,−1)∪(0,1)∪(2,∞)(-\sqrt{2},-1)\cup(0,1)\cup(\sqrt{2},\infty) c) (−∞,−2)∪(−1,0)∪(1,2)(-\infty,-\sqrt{2})\cup(-1,0)\cup(1,\sqrt{2}) d) (−∞,−2)∪(0,2)(-\infty,-\sqrt{2})\cup(0,\sqrt{2})

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