Question

help please

Answer 1

\[\int\limits_{?}^{?}\sec ^{3}x tanx dx\]

Answer 2

the dx is suppose to be separate

Answer 3

try
\[u=\sec(x)\]

Answer 4

typo there i meant
\[\int u^2 du\]

Answer 5

so you took a sec from the sec ^3 to make du am i correct?

Answer 6

no they are using u du substitution
A real powerful method
u = secx
du = secxtanx dx