What is the integrated form of $\displaystyle \int4cos(5x)dx$ and $\displaystyle \int\frac{4}{cos^2x}dx$?

The answers I got are $\displaystyle \frac{4}{5}sin(5x)+C$ and $\displaystyle 4tanx+C$, respectively.

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- May 6th 2006, 04:38 PMcinderintegration with trig functions
What is the integrated form of $\displaystyle \int4cos(5x)dx$ and $\displaystyle \int\frac{4}{cos^2x}dx$?

The answers I got are $\displaystyle \frac{4}{5}sin(5x)+C$ and $\displaystyle 4tanx+C$, respectively. - May 6th 2006, 06:24 PMAfterShock
Are you wanting the process of finding those, or are you just checking to see if the answers are correct? You could just check by differentiating; if you do, you will notice that those are the correct answers.

- May 6th 2006, 06:33 PMcinder
I thought they were correct, but I'm looking at an old calculus exam of mine and they are marked wrong. :confused:

I guess I should have said something earlier. Thanks. - May 6th 2006, 06:50 PMThePerfectHackerQuote:

Originally Posted by**cinder**

This is may 1:):):)th Post

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