2∂∂∂TXT∂ = A2 2∂ T=0 = 2X ∂ + TCOSX UT=0 = SINX, 22UUU

11. - BAI TAP CHO 16 UNIT 12 CO DAP AN
BAI TAP CHO 16 UNIT 12 CO DAP AN
11.

2

∂tx∂ = a

2

2

∂

t=0

= 2x ∂ + tcosx u

t=0

= sinx,

2

u