What is the domain and range of f(x) = cos(x)?

a. The domain is all real numbers and the range is -1

Question

What is the domain and range of f(x) = cos(x)?
		
a. The domain is all real numbers and the range is -1<y<1      

		
b.The domain is -1<x<1 and the range is all real numbers.

		
c. The domain is all real numbers and the range is -1<y<1    

		
d. The domain is all real numbers and the range is -1<x<1

misty1212 · Answer

HI!!

misty1212 · Answer

what is the difference between A and C?

anonymous · Answer

i really have no clue on how to do this :/

anonymous · Answer

Domain: R (All real numbers)
 Range: [−1, 1]

anonymous · Answer

Since the graph of this is the wavey thing starting at y=1 and never going below -1, 1 and -1 are included. The domain is all real numbers because the graph is elliptical and goes on forever in either direction.

anonymous · Answer

then all the multiple choices are wrong??

anonymous · Answer

it should be -1 ( less than or equal to) y (greater than or equal to) 1

anonymous · Answer

for the range

anonymous · Answer

hey i need your help