As a Demon Hunter in Diablo 3, the invisible snake monsters in Act 2 Inferno are my worst enemy.  They seem to be tailored to kill Demon Hunters specifically. They use invisible/cloak and approach you while stealthed.  They only break stealth when they're close to your or your companion.  In Inferno difficulty, Demon Hunters get killed in 1 hit, so obviously this is a problem.

The best tips I've found to killing them is to use Caltrops in your spec (I used the rune that does damage to enemies, but the immobilization one is good too) and hug it when you suspect that there are stealth snakes around.  Also, they seem to come out of stealth if you run by them with Smoke Screen up, so you can run through some open space with it up to try and knock them out of stealth.

Regardless, you will die to them. A lot. There are times when they just come out of stealth and instantly kill you.

These snakes are a big reason that soloing Act 2 as a Demon Hunter seems like a bad idea to me.

Hyechan has a good post on the matter on the official Diabo 3 forums. Go to Hyechan's post on defeating the invisible Act 2 inferno snakes as a Demon Hunter, or read the copy of his post below:

There are three, correct me if I'm wrong, types of invisible snakes in Act 2: Writhing Deceiver, Copperfang Lurker, and some other one. Either way, they all have spears.

Some important properties

• Before going invisible, they hiss. They hiss usually right before they come out of cloak (if you're close enough to hear them)
• You can see their shadows right before they come out of cloak - not very useful in the sewers but still a noticeable property.
• Writhing deceiver has a max cloak time of 7~8 seconds PER cloak. Same with Copperfang Lurker but they often come out of cloak in 6 seconds
• Running past them with smokescreen on will make them come out of cloak if you're close enough. This is likely a glitch because of how smokescreen sometimes does not get rid of aggro while SS'd (still in debate, however)
• Snares will still be in effect when they go into cloak

When do they come out of cloak?

• When their cloak timer runs out ~8 seconds.
• You're in range
• Your companion is in range
• An NPC combatant is in range

How do I combat these things?
There are several ways, although this list is by no means exhaustive

1. Defeating them using 0 discipline

Note that this only works when: a. You have a head count of all of them b. They aren't illusionists c. You have kiting space d. they aren't fast-affixed

The max cloak time for these snakes is no more than eight seconds. If you see or hear them cloak, start running the opposite way for 6 to 7 seconds depending on how far they were initially. After 6 to 7 seconds, turn around and start spamming your desired attack. Their cloak timer will run out at 8 seconds (earlier for Copperfangs) and they'll get shat on by your attacks especially if it's Nether Tentacles

WARNING: Start counting to 8 after the LAST snake has cloaked. You don't want to turn around early because you started counting after the first cloak. A pack does not cloak at the same time.

2. Defeating them with minimal discipline used

Works when: a. you lose count of how many snakes there are b. there is less kiting space to work with c. works best in narrow spaces but can be used in larger spaces

You need: Caltrops with torturous ground
If you are stuck with any of the conditions a,b,c listed above, you still have a chance at beating these guys. Place a caltrops (you may need to place more than one in succession depending on how many there are)

Stand right behind the caltrops but not too close, obviously. When they decide to come out of cloak, it will be right on top of the caltrops. As I've mentioned above, their shadows will come out first and that's when the caltrops will actually trigger. This gives you a split second to move a little bit back if they end up being too close to you. Use your desired attack when they are rooted.

3. Defeating them using lots of discipline (for emergencies)

Used when: a. There are too many damn snakes b. They're fast and like to multiply c. You're in a tight, enclosed space

You'll need a lot of luck for this one but you can increase your chances significantly if you do it properly. Here is a video of me doing "Royal Audience" - just skip to 1:30: Video link

Needed stuff: Preparation, Smokescreen, Caltrops, and optionally vault with tactical advantage passive.

If for some reason you have vault AND TA on you, you can just start jumping away at high speeds WITH smokescreen on if you so desire. 

If you're not using vault, I suggest you use copius amounts of caltrops and if available, bait your companion/npc's (like I did to Leah) in order for them to come out of cloak. Pop smoke screen whenever possible to stay alive. Use both tactics 1 and 2 to try and stay alive but in the end, there is a lot of luck element to it when you're simply overwhelmed, so try not to get into that situation! 

If you have any questions about certain elites (except invul minions/reflect damage which I just simply skip) or about any other Act 2 monsters, go ahead! I hope this somewhat helps

What do you think?  Do you have any good tips for beating these things as a solo Demon Hunter?