Answer:
reflect y = cos x over the x-axis
Step-by-step explanation:
When a function is reflected over the x-axis, the transformation is:
y = -f(x)
If it were reflected over the y-axis, the transformation would be:
y = f(-x)
x= 10/9, or 10 over 9
138.23
2πrh+2πr^2=2·π·2·9+2·π·2^2
