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y'=[f ' (x) * g(x)- f (x) * g '(x)] / [g(x)]²
f(x)=4
f '(x)= 0
g(x)=x²
g '(x)= 2*x
y'=[f ' (x) * g(x)- f (x) * g '(x)] / [g(x)]²=[0*x² - 4*2*x]/ [x²]²=
-8x/x⁴=-8/x³