Third order differential equation: Variation of parameters: y''' + y' = tan(x)

[@stchannel6413]

Which is used for typing equation?

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MathType

[@rubendarioagredonova8459]

De que libro es?

[@NAMJ432]

Ecuaciones de zill

[@ViralSerials786]

Perfect 🔥

[@lizgabrielafarfanjulca6296]

gracias!!!!!!

[@eduardorobles2359]

you have a mistake in integral of tan(X) its -ln(cos(X)) not ln(sec(x))

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actually both are same.
- ln (cos x) = (-1) ln (cos x)
use log rule ---> b ln a = ln (a^b)
= ln ((cos x)^(-1))
= ln (1/cos x)
= ln (sec x)
both are same.

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Mou sd kuch bol b do

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