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Author Topic: C1 and C2 DOUBTS HERE!!!!!  (Read 98305 times)

Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #165 on: June 06, 2010, 12:24:52 pm »
Quote from: Ibiza279 on June 05, 2010, 09:41:54 pm
im havin difficulty in math c2 jan 2010 question 8 part c 

In 30 mins.
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Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #166 on: June 06, 2010, 12:46:26 pm »
January 2010 Question 7 (d)

Find the area underneath the curve between (4,0) and (5,0)

Because this area in combination with the region are will make a triangle.

\int_{4}^{5}(x^2-5x+4)=\frac{11}{6}

The area of the triangle is \frac{1}{2}*4*4=8

So, now simply take away the excess region from the triangle.

8-\frac{11}{6}=6\frac{1}{6}
« Last Edit: June 06, 2010, 12:49:09 pm by Engraved »
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Offline Ibiza279

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Re: C2 DOUBTS HERE!!!!!
« Reply #167 on: June 06, 2010, 05:16:24 pm »
Quote from: Engraved on June 06, 2010, 12:46:26 pm
January 2010 Question 7 (d)

Find the area underneath the curve between (4,0) and (5,0)

Because this area in combination with the region are will make a triangle.

\int_{4}^{5}(x^2-5x+4)=\frac{11}{6}

The area of the triangle is \frac{1}{2}*4*4=8

So, now simply take away the excess region from the triangle.

8-\frac{11}{6}=6\frac{1}{6}



aaah now i get it, Thanks alot dude ! :)
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live life like you'll never die but don't die like you never lived but then again its a saying n i don't believe in saying much so jus forget it . . .

Offline halosh92

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Re: C2 DOUBTS HERE!!!!!
« Reply #168 on: June 07, 2010, 03:51:55 pm »
in trignometrical identity.
if cos thita= -2/3 and cos  thita = 1
in the first answer we get 132 and 228
but for the seocnd part we got 0
dont we also get 90 and 270 ?
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #169 on: June 07, 2010, 04:00:56 pm »
Quote from: halosh92 on June 07, 2010, 03:51:55 pm
in trignometrical identity.
if cos thita= -2/3 and cos  thita = 1
in the first answer we get 132 and 228
but for the seocnd part we got 0
dont we also get 90 and 270 ?

Please post the exact question. And post as many as you can today, because for today, I am focused on C2.
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Alpha

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Re: C2 DOUBTS HERE!!!!!
« Reply #170 on: June 07, 2010, 04:05:47 pm »
Quote from: halosh92 on June 07, 2010, 03:51:55 pm
in trignometrical identity.
if cos thita= -2/3 and cos  thita = 1
in the first answer we get 132 and 228
but for the seocnd part we got 0
dont we also get 90 and 270 ?

cos  theta = 1 is 0 and 360, if 360 is inclusive.

90 and 270 are values for cos  theta = 0. 

You are confusing with sin theta = 1 and -1.
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Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #171 on: June 07, 2010, 05:17:47 pm »
Quote from: ~Alpha on June 07, 2010, 04:05:47 pm
cos  theta = 1 is 0 and 360, if 360 is inclusive.

90 and 270 are values for cos  theta = 0. 

You are confusing with sin theta = 1 and -1.

Its good to see you helping Alpha, very much appreciated.
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Alpha

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Re: C2 DOUBTS HERE!!!!!
« Reply #172 on: June 07, 2010, 05:22:32 pm »
Quote from: Engraved on June 07, 2010, 05:17:47 pm
Its good to see you helping Alpha, very much appreciated.

Thank you.  :)

Love trigonometry.

I'm just wondering...

Stupid question: what is C2?

Heard about M1, M2, S1, S2... Never C2  ???
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Offline halosh92

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Re: C2 DOUBTS HERE!!!!!
« Reply #173 on: June 07, 2010, 05:24:22 pm »
ok thx alpha.

one more question
Q7b
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #174 on: June 07, 2010, 05:24:47 pm »
Quote from: ~Alpha on June 07, 2010, 05:22:32 pm
Thank you.  :)

I'm just wondering...

Stupid question: what is C2?

Heard about M1, M2, S1, S2... Never C2  ???

It essentially means, Core Mathematics 2. It is a part of the AS Edexcel Mathematics course. You have to do C1 & C2 and another Application Unit such as Mechanics, Statistics or Decision mathematics.

What Qual are you doing? International Baccalaureate perhaps?
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Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #175 on: June 07, 2010, 05:26:01 pm »
Quote from: halosh92 on June 07, 2010, 05:24:22 pm
ok thx alpha.

one more question
Q7b

On it now.
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Alpha

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Re: C2 DOUBTS HERE!!!!!
« Reply #176 on: June 07, 2010, 05:27:31 pm »
Quote from: Engraved on June 07, 2010, 05:24:47 pm
It essentially means, Core Mathematics 2. It is a part of the AS Edexcel Mathematics course. You have to do C1 & C2 and another Application Unit such as Mechanics, Statistics or Decision mathematics.

What Qual are you doing? International Baccalaureate perhaps?

Ah simply Core...  ;D

I'm doing Core and Statistics, A Level. But we always refer to it as main papers here. Thank you.  ;D

Halosh, I can't open the file?
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Alpha

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Re: C2 DOUBTS HERE!!!!!
« Reply #177 on: June 07, 2010, 05:42:16 pm »
Quote from: halosh92 on June 07, 2010, 05:24:22 pm
ok thx alpha.

one more question
Q7b

V = 4x(x^2 – 45x + 500).

V = 4x(x - 25)(x - 20).

Volume cannot be negative; x > 25.
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Offline halosh92

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Re: C2 DOUBTS HERE!!!!!
« Reply #178 on: June 07, 2010, 05:44:40 pm »
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline Saladin

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Re: C2 DOUBTS HERE!!!!!
« Reply #179 on: June 07, 2010, 05:46:15 pm »
Quote from: halosh92 on June 07, 2010, 05:24:22 pm
ok thx alpha.

one more question
Q7b

The range of the values is 25>x>20
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