- Thread starter
- #1
\(\displaystyle 20 \int \frac{1}{\cos^3(x)}\)I'm having a hard time breaking this down using tri identities.
} = integral sign
20}sec^3(x) dx
20}sec^2(x) * sec(x) dx
20}[tan^2(x)-1] * sec(x) dx
after this I'm stuck. I tried letting u = tan(x) or sec(x) but i cant seem to cancel anything out.
Coooool! I've never seen that method.Multiply by \(\displaystyle \dfrac{\cos(x)}{\cos(x)}\)