∫ 3sin^2(0.6t)*t dt =?
0
解:∫3sin^2(0.6t)*t dt =3∫td(3sin^2(0.6t))
=3t3sin^2(0.6t)-3∫sin^2(0.6t)dt
=3t3sin^2(0.6t)-3x/2+3/4sin2x+c
这里要用到一个公式:就是∫sin^2xdx=x/2-1/4sin2x+c,望采纳,谢谢!