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(cos(6*x^7))'The calculation above is a derivative of the function f (x)
-sin(6*x^7)*(6*x^7)'
-sin(6*x^7)*((6)'*x^7+6*(x^7)')
-sin(6*x^7)*(0*x^7+6*(x^7)')
-sin(6*x^7)*(0*x^7+6*7*x^(7-1))
-sin(6*x^7)*(0*x^7+6*7*x^6)
42*x^6*(-sin(6*x^7))
-42*x^6*sin(6*x^7)
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