# Thread: How To Use Sin, Cos or Tan?

1. ## How To Use Sin, Cos or Tan?

Okay I know when to use Sin, Cos or Tan but I don't know how. I'm completely lost here so could someone please explain to me how to use Sin, cos and tan properly? I've got an exam tomorrow which will decide if I get moved classes or not, and I have to pass this.

This is my first post so I hope this is in the right place.

2. Originally Posted by Astronaut
Okay I know when to use Sin, Cos or Tan but I don't know how. I'm completely lost here so could someone please explain to me how to use Sin, cos and tan properly? I've got an exam tomorrow which will decide if I get moved classes or not, and I have to pass this.

This is my first post so I hope this is in the right place.
Hi Astronaut

Such a general question is hard to answer... Give us an example of the problem you are facing and we will help you

Good Luck!

3. Okay so lets say you have to find the hypotenuse and you have the Opposite angle and the Adjacent side so you have to use Tan right? But how do you use Tan?? Same goes for using Sin and Cos.

4. Originally Posted by Astronaut
Okay so lets say you have to find the hypotenuse and you have the Opposite angle and the Adjacent side so you have to use Tan right? But how do you use Tan?? Same goes for using Sin and Cos.
Tangent of an ANGLE is equal to the OPPOSITE side divided by the ADJACENT side.

$\tan(\theta) = \frac{O}{A}$

Perhaps, the trick SOH-CAH-TOA will help you.

Reviewing trig functions make help you a lot.