-π/2 < arctan(x) < π/2
So cos(π/2) < cos(arctan(x)) < cos(0)
0 < cos(arctan(x)) < 1
Yes I can help you with the question you have displayed
Answer:
C:108+4x+4=180
Step-by-step explanation:
The angles are supplementary so they sum up to 180
20 beacause 120 divided by 6 equals 20 so 60x20=120