New to the forums, trouble with an integral

[jhayes25]

Hello all, I am new to these forums. I'm having trouble with a problem on homework. It seems simple but it is giving me problems.

It is an indefinite integral: Integral of (Sin(2x))/(Sinx)dx

Is there a way to use substitution? Help is appreciated.

 

[rocomath]

$$\int\frac{\sin{2x}}{\sin x}dx$$

Use the trig identity.

$$\sin{2x}=2\sin x \cos x$$

 

[awvvu]

Use the identity:

$$sin(2x) = 2sin(x)cos(x)$$

 

[jhayes25]

roco, that is correct. Obviously a newb, I have no idea how you did that. I'm sure there are stickies somewhere that I need to read.

 

[rocomath]

roco, that is correct. Obviously a newb, I have no idea how you did that. I'm sure there are stickies somewhere that I need to read.

Introducing LaTeX Math Typesetting - https://www.physicsforums.com/showthread.php?t=8997

Enjoy!

 

[jhayes25]

Alright, wow that is simple when you now the identities. Guess i should get to learning those lol thanks awvvu