Write the expression as the sine, cosine, or tangent of an angle. cos pi/5 * cos x - sin pi/5 * sin x

if you mean

then it's c. 8, -7/3

but if you mean

then it is

1. perpendicular

2. parallel

3. perpendicular

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!