Points of $w^2=h(t)$ over $t=c$: two when $h(c)\ne0$, only $w=0$ when $h(c)=0$ · Prove2Me

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Points of $w^2=h(t)$ over $t=c$: two when $h(c)\ne0$, only $w=0$ when $h(c)=0$ · Prove2Me