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Find the derivative of `f(x)=``4x^3+7x^7` .
`f'(x)=`
`f'(x)=`
Get help:
Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question
`12 x^(2) + 49 x^(6)`