COS 2X4 11 COS 4X2 11 2 COS 4X COS 4X2 4 4   1 1 COS 8X 1 ...

1. - TICH PHAN 141 BAI TAP TRAC NGHIEM NGUYEN HAM NANG CAO FILE WORD
TICH PHAN 141 BAI TAP TRAC NGHIEM NGUYEN HAM NANG CAO FILE WORD

1. Ta có:

cos 2x

4

1

1 cos 4x

2

1

1 2 cos 4x cos 4x

2

4

4

1

1 cos 8x

1

1 2 cos 4x

3 4 cos 4x cos 8x

4

2

8

1

1

1

 

I

(3 4 cos 4x cos 8x)dx

3x sin 4x

sin 8x

C

8

8

8