∫ (COS 6X−COS 4X DX) LÀ A.6SIN 6X 5SIN 4X C− +B. 1 1SIN 6X...

Câu 19.

∫ (

cos 6xcos 4x dx

)

A.6sin 6x 5sin 4x C− +B. 1 1sin 6x sin 4x C− + +

C.−6sin 6x sin 4x C+ +

D.1 16 46 −4 +