CHO ΠI 2F (X) X.SIN X 3G(X) DX F (X)DX 2G(X)DX  1000A....

Câu 23. Cho

π

I

2f (x) x.sin x 3g(x) dx f (x)dx 2g(x)dx  1

0

A. I 7 π  B. I 7 4π  C. I π 1  D. I 7 π 4