I need a little help with number 7. I don't really now where to start.

* Homework 3.6 - MA 141, section x ) My Thumbs Up by cullenma x *Homework Help - Q&A from On C https://www.webassign.net/web/Student/Assignment-Responses/submit?dep=27258410&tags=autosave#question3779389_7 "o MyPack Portal 8 Wolfpaw Portal Disney+ Discovery+ h Hulu ESPN+ (7) Grubhub \\ My Drive M Gmail $ Moodle 8 Hall Menu V Vanguard Cengage Wolfpack Club Chat Padlet TV & Library $ E115 @) Insta /m Converter Mining 6. [4/4 Points] DETAILS PREVIOUS ANSWERS MY NOTES Evaluate the indefinite integral / 8 sec?(x) dx. (Use C for the constant of integration.) 8 tan(x) + C 7. [-/9 Points] DETAILS MY NOTES Show that F(x) = sin(x2 + x) is an antiderivative of f(x) = (2x + 1) cos(x2 + x). Recall that a function F is an antiderivative of fif F'(x) = f(x). Find F'(x) for F(x) = sin(x2 + x). F' ( x ) = Since F'(x) [-Select- v f(x), F(x) [-Select--- v ] an antiderivative of f(x). Use the above results to evaluate the indefinite integral / (14x + 7) cos(x2 + x) dx. (Use C for the constant of integration.) Submit Answer 8. [4/4 Points] DETAILS PREVIOUS ANSWERS MY NOTES Evaluate the indefinite integral / 6 sec(3x) tan(3x) dx. (Use C for the constant of integration.) 2 sec(3x) + C Submit Assignment Save Assignment Progress Type here to search O O 490F Partly cloudy ^ - 7() 12:12 AM 11/3/2021