founders.edtell.com Calculus Calculator - Symbolab Integral of 7xcox - Integral Calculator - Symbolab Lessons > Review for Test 3 Review for Test 3 • Review Test Questions Part 1 of 1 - Question 15 of 50 2 Points Use integration by parts and substitution to evaluate the integral. / 7x cos 9x dx • A. £x sin 9x + 2 cos 9x +C A • B. 2xcos 9x + 3 sin 9x + C . c. x sin 9x + 3 cos 9x +C • D. 2xsin 9x - cos 9x +C Reset Selection Previous Next Copyright 2010-2019 edtell, LLC. All rights reserved. Portions of this software are copyrighted by other parties as descr