integrate question: any help, im thinking it has to do with identities?
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It looks kind of evil, but it's actually not that difficult. You can split it up into two different integrals. Now use u-subs, taking the 4x+5 and the 7-8x to be the u's for the two different integrals. I think it yields:
Originally Posted by DJMinkus It looks kind of evil, but it's actually not that difficult. You can split it up into two different integrals. Now use u-subs, taking the 4x+5 and the 7-8x to be the u's for the two different integrals. I think it yields: shouldnt it be ? if theres a minus there already and u have a plus from the sin coming in for the cos?
But don't forget, the coefficient for x in the sin function is -8, making du = -8 and thus causing the two minuses (from the original equation and then from the integration) to cancel out, yielding a positive.
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