peterp2509

Q1,
find the area of the region cut from the 1st quadrant by the curvr r=2(2-sin2θ)^1/2.

i tried this one to evaluate the area but cannot the cal. the ans.


i don't know how to cal. 後面個part

Q2
find the volume of the region cut from the solid sphere p<=a by the half-plane θ=0 and θ=pi/6 in the first octant.

i don't understand what the question is asking about.
can someone show me steps?

thank you so much!!!

felixtangc

樓主錯區?!
定係呢d係大學野?

peterp2509

if u feel easy, solve them for me plz.

peterp2509

push!~~

peterp2509

any special skills when finding limits of multivariable function?

help to evaluate the volume and surface area as well, i am not sure about the integral

Dennis07

I am a s5 student =.-= =
just help u to push!!

lopo42

引用:

原帖由 peterp2509 於 2010-4-18 05:00 PM 發表
Q1,
find the area of the region cut from the 1st quadrant by the curvr r=2(2-sin2θ)^1/2.

i tried this one to evaluate the area but cannot the cal. the ans.
26649

i don't know how to cal ...

我想問θ唔係由0到pi/2?
同埋,ans=2pi-2  ????

[ 本帖最後由 lopo42 於 2010-4-27 12:03 PM 編輯 ]

peterp2509

1st quadrant and sin2θ wor...
i don't know the ans.
can you  show how to cal. the ans. ???

lopo42

1st quadrant 唔係指個θ由x-axis掃到y-axis????

peterp2509

you are right
i'm asking for numerical ans.
can you solve the other questions first. thx.

[ 本帖最後由 peterp2509 於 2010-4-27 07:00 PM 編輯 ]

lopo42

抱歉...我完全唔知其他係問乜
怒我多問..你呢d係問題咩level?

peterp2509

U yr1.

xXJohnXx

我而家先留意到有d咁o既野 : o
Is it too late now? ....
Q.1 why dun u use the formula area = 1/2 * integrate (theta_1 to theta_2) r(theta) d(theta)

peterp2509

5... really too late, i just finished the exam~~@@~~