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### What is the derivative of f(x)=a^4+cos^4(x) ?

- The derivative of f(x)=a^4+cos^4(x) is -4cos^3(x)sin(x)
### What is the first derivative of f(x)=a^4+cos^4(x) ?

- The first derivative of f(x)=a^4+cos^4(x) is -4cos^3(x)sin(x)

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