 C OS 2 XDX BẰNG

Câu 194.  c os ² xdx ^bằng:

   

x x C

 

a) 1 sin 2

  b) ¹  ^{2 sin 2} 

4 2

4 x  x  C

  

c) ¹  ^{sin 2} 

4 x  x  C d) ¹  ^{2 sin 2} 

4 x x C