2∂∂∂TXT∂ = A2 2∂ T=0 = X + COSX ∂ + TE-X UT=0 = SINX, 22UUU

9. - BAI TAP CHO 16 UNIT 12 CO DAP AN
BAI TAP CHO 16 UNIT 12 CO DAP AN
9.

2

∂tx∂ = a

2

2

∂

t=0

= x + cosx ∂ + te

-x

u

t=0

= sinx,

2

u