giúp mình 2 câu tp vs log nhá

C

cuongnb.1993

1/
I=tik phan 0 den π/3 cua (2xsinxcosxdx)/cos^4x
= 2. tik phan 0 den π/3 cua (x.sinx dx)/cos^3 x
tung phan:
dat U=x => U'=1
dv= sinxdx/cos^3 x => v=1/2cos^2x
I=2[x/2cos^2x can 0 den π/3- 1/2 tik phan cua 1/cos^2 x can 0 den π/3]
toi day ban tu lam dc roi
 
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