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函數f(x)=0, 解f(x)=0的方程根x e.g., f(x)=ax+b=0 ==>x=-b/x f(x)=ax*x+bx+c=0 ==> x=[-b±(b^2-4ac)^(1/2)]/2a f(x)=asin(x)+b=0 ==> x=arcsin(-b/a)
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