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# Volume of revolution question watch

1. Can someone help please I'm stuck on part (b) of this question, I got to

Pi{(4sin^3(pi/2)) - (4sin^3(0))}

I'm having trouble with putting it in an exact form because I don't get an answer in terms of pi, unless I'm supposed to leave it as 4(pi)sin^3(pi/2)?

Posted from TSR Mobile
2. (Original post by mica-lwe)
Can someone help please I'm stuck on part (b) of this question, I got to

Pi{(4sin^3(pi/2)) - (4sin^3(0))}

I'm having trouble with putting it in an exact form because I don't get an answer in terms of pi, unless I'm supposed to leave it as 4(pi)sin^3(pi/2)?

Posted from TSR Mobile
4(pi)sin^3(pi/2)=4pi
3. (Original post by mica-lwe)
Can someone help please I'm stuck on part (b) of this question, I got to

Pi{(4sin^3(pi/2)) - (4sin^3(0))}

I'm having trouble with putting it in an exact form because I don't get an answer in terms of pi, unless I'm supposed to leave it as 4(pi)sin^3(pi/2)?

Posted from TSR Mobile
Can you evaluate ?
4. (Original post by TeeEm)
4(pi)sin^3(pi/2)=4pi
All true but this isn't the answer to the question shown in the diagram.
5. (Original post by Mr M)
Can you evaluate ?
-cos(pi/2)... I think
6. (Original post by mica-lwe)
-cos(pi/2)... I think
I'm afraid you don't seem to have a clue about what you are doing.

It doesn't matter anyway as your working is wrong. I suggest you ask your teacher to go through this with you tomorrow.
7. (Original post by Mr M)
All true but this isn't the answer to the question shown in the diagram.
did not look at no diagram

I merely answered the student's question in evaluation.
please feel free to assist if there are further mistakes
8. (Original post by TeeEm)
did not look at no diagram
You may be the gangsta rapper of maths.
9. (Original post by Mr M)
You may be the gangsta rapper of maths.
I am from da hood ...

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