½[cos 2 X cosx/2 - 2 cos9x/2-3sin5x/2]

Where's the context of this question?

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation:

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !