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Derivativeshard
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Given f′(x)=g(x)f'(x) = g(x)f′(x)=g(x) and g′(x)=−f(x)g'(x) = -f(x)g′(x)=−f(x). What is the 4th derivative f(4)(x)f^{(4)}(x)f(4)(x)?