whats the indefinite integral of sin3x cos 3x dx?
Also can I get a link of the identities? my teacher has included 1 and the textbook only 1 or 2. thanks!

Question

whats the indefinite integral of sin3x cos 3x dx?
Also can I get a link of the identities? my teacher has included 1 and the textbook only 1 or 2. thanks!

anonymous · Answer

$$\int\limits_{}^{} \frac{ 1 }{ 2 } \sin 6t +\sin(0)$$
which gives  $$\frac{ 1 }{ 12 } \cos 6x + c$$
But the correct answer is  
$$\frac{ -1 }{ 12 } \cos 6x + c$$ 
Please explain

anonymous · Answer

Integral of sin 6x is -cos 6x /6.

anonymous · Answer

oh right..rookie mistake, btw do u have any link to identies containing cos and sin?

anonymous · Answer

https://www.math.ucdavis.edu/~kouba/CalcTwoDIRECTORY/trigintdirectory/TrigInt.html