QUESTION
5. [0/4 Points] DETAILS MY NOTES Evaluate the integral by making the given substitution, giving your answer in terms of $x$. (Use c for the constant of integration.) \[ \int \cos (3 x) d x, \quad u=3 x \] 6. $[0 / 2$ Points $]$ DETAILS MY NOTES Evaluate the definite integral. \[ \int_{0}^{1} \sqrt{1+8 x} d x \]
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