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what's arcoss?

inverse cosine, with a little spelling error probably :)

Yes

Yes i do understand but im a bit confused is on the \[(\frac{ b+acosx }{ a+bcosx })\prime \]

would i use the quotient rule ?

Yes good c:

awesome , thanks for your help !

Would this be correct
\[\frac{ (1+sinx)[(b+acosx)-(a+bcosx)] }{ (a+bcosx)^{2} }\]

thank you

Thanks !