Answer: -1
Step-by-step explanation:
i really don't know but i was taking a test and i guessed it and it was right
From the diagram you can see that for all

This means that function is constant on the interval 
Answer: correct choice is C.
Step-by-step explanation:

Answer:
y=14
Step-by-step explanation:
plug in -2 in the place of x
y=-7(-2) y=14
Csc x · sec x - tan x =
= 1 / sin x · 1 / cos x - sin x / cos x =
= 1 / sinx cos x - sin² x / sin x cos x =
= ( 1 - sin² x ) / (sin x cos x) =
= cos² x / ( sin x cos x ) =
= cos x / sin x = cot x