Number 15 is 80 i dont know about the others...sorry
-π/2 < arctan(x) < π/2
So cos(π/2) < cos(arctan(x)) < cos(0)
0 < cos(arctan(x)) < 1
Answer:
Step-by-step explanation:
The answer is A
I need more info to answer your question. Can please tell me the answer choices?
