Where will we use sin, cos and tan for everyday life?

People who use trigonometric functions:

Surveyors

Navigators

Electrical engineers

Mechanical engineers

.... etc.

Depends on what career you adopt.  You probably won't need them if you stack shelves in a supermarket!

you wont but i think since sin cos and tan is math and if you practice any type of math you will get better at it overall. because it practices division multiplication and other important factors but trust me it might not seem like it now but you will need all the knowledge you can to help you succeed in this world even if it might not look like it now.  

Just about any technical field you can name probably uses trig. That's not to say that YOU might ever need them in "real life," but....you never know !!! The job market is becoming more sophisticated all the time..........