Question

Math homework help please​

Answer 1

option 1 is correct

y= 1/2 cos 2x

Step-by-step explanation

put x= 0

as cos 0= 1

y= 1/2= 0.5

Now put x = π/4

y= 1/2 cos 2*(π/4)=1/2 cosπ/2=0

as cosπ/2=0