1 Evaluate the following integrals using integration by parts Clearly denote what is playing the role of u du du and v a in zdr Hint The integral is equivalent to In a 1dx b in Hint Set u In r as in the integration by parts formula Use your answer from part a c farctan Hint Use the same hint from part a d a cos x dx Hint Rewrite the integrand as r r cos x Now experiment as to what to set u and du equal to Do not use online resources nrdr ctan x dx