Answer:
if you have y= 2x, y is in terms of x and you can input different values of x to obtain corresponding values outputs of y.
Answer:

Step-by-step explanation:
Let:

This allows us to manipulate the equations like we normally would.

Then, we return the values where they belong.

Finally, we add:

Answer:
It's cot x :)
Step-by-step explanation:
I'm not really good at explaining,but I know that's the answer :))