# Trig integration

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1. Feb 4, 2016

### anthonybommarito1

1. The problem statement, all variables and given/known data

∫sin(2sinh(3x))
2. Relevant equations

3. The attempt at a solution
okay so i did a u substitution letting u=3x so we get 1/3∫sin(2sinh(u)) but i have no idea how to get rid of the sinh, i tried writing in exponential form or maybe i have to use some identity.. im not sure where to go from there!

2. Feb 4, 2016

### SteamKing

Staff Emeritus
You should always include the dx or whatever when writing an integral.

It's not clear this integral even has an anti-derivative which can be expressed in terms of elementary functions.

Where does this integral come from?