difference between have a look and take a look

What is the difference between 'take a look' and 'have a look' in English?

answer:

There is no fundamental difference in meaning, but 'take a look' can have a very slightly more informal/casual usage than 'have a look'. 

Examples: 

1. Patient to doctor: "Would you have a look at my throat, please Doctor? It's been sore for over a week now."
2. School friend to school friend: "Hey! Take a look at that new teacher's car!" 

What's the difference between 'HAVE A LOOK' and 'TAKE A LOOK'?

• Take a look = Command 
  Have a look = your asking them and giving to the the chance to do so.... hm?

• take a look.... have a look is more formal and sound like some british snob would say... i always say "hey look" but thats me

• there's a nuance between the two in that "have a look" almost implies "you're welcome to look at this if you'd like to," whereas "take a look" seems to say, "please look at this."
  
  A very subtle difference, however; generally, as you say, they're interchangeable. As for the question of American-English versus British- or Australian-English, my guess------and it is strictly that!-------would be that "take a look" is more American and "have a look" perhaps more English.