king123

Hey guys, I could use some help with these problems: (I don't know how to get any of the symbols so bear with me) integral from 0 to pi/4 of cos^4(4x)sin(4x)dx integral(x^3-5x+2)/(x^2+49)dx integral 2x^3squareroot(25+36x^2)dx integral sin^2(5x)cos^5(5x)dx integral sin^2(6x)cos^2(6x)dx Any kind of help and/or solutions would be appreciated here.