TM NGHI^E.M T^O'NG QUAT CU'A PHU.O.NG TRNH

128)

Tm nghi^e.m t^o'ng quat cu'a phu.o.ng trnh:

^x

²

^y

⁰⁰

^−2y=x

³

^cosx

bi^et m^o.t nghi^e.m ri^eng cu'a phu.o.ng trnh thu^an nh^at la

^y

¹

^=x

²

.

HD gia’i:

Tm NR da.ng

^y

²

^{= uy}

¹

^{= ux}

²

du.o..c

^y

²

^{= −}_3x¹

. Nhu. v^a.y NTQ:

^{y =}C

₁

x

²

+ C

₂

x

. Bi^en thi^en hang s^o du.o..c

^C

⁰

¹

⁼⁻¹₃^cosx;C

⁰

²

^=x

³

^cosx

...