Fundamentals - ok......practice for CBSE math.....easy stuff

11

Mani Pal Singh ·2009-03-15 03:50:17

TRIGONOMETRY +2 KE BOARDS MEIN NAHIN HAI[3]

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Subash ·2009-03-13 08:43:45

hey KR 2 is wrong i think limits are not -a to +a sort

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Akand ·2009-03-13 08:10:47

u gotta be kiddin sky..........thts wat they teach u at d startin of d year....d principle intervals of inverse functions......
wel i guess u do complex and difficult questions only hehehe...[3][3]
k...take d interval for tan inverse and ull get in a second....its a ONE mark question........

try 2nd its nice...may take a while

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1

Anuj ·2009-03-13 08:16:31

tryin' the 3rd.........

what to do in 1st and 2nd

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Akand ·2009-03-13 08:18:20

wat do u mean wat to do??????
INTEGRATE in 2nd.............................and find d final value in 1st......

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11

Mani Pal Singh ·2009-03-13 08:19:34

1)principal value of tanx varies from-âˆ©/2 to âˆ©/2
so âˆ©/6+âˆ©/6=âˆ©/3

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1

Anuj ·2009-03-13 08:21:10

3. Rs 1350
a works for 5 days, B works for 3 days

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11

Mani Pal Singh ·2009-03-13 08:21:57

2)HINT its an ODD function[1]

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1

Anuj ·2009-03-13 08:22:04

i mean how to integrate???

and how to proceed in 1st????

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1

Anuj ·2009-03-13 08:23:11

3rd correct???[7][7]

i hope it is.........

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1

Akand ·2009-03-13 08:24:13

hey mue................check tht 3rd again.....u r gettin an unbounded region rite?????? so did u try for 150x+200y<1350??? thts d tricky part..............u havent finishd d question yet..

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1

KR ·2009-03-13 08:24:19

1)=tan^{-1}\left(tan\left(\frac{7\pi }{6} \right) \right)+cot^{-1}\left(cot\left(\frac{7\pi }{6} \right) \right) \Rightarrow tan^{-1}\left(tan\left(\pi +\frac{\pi }{6} \right) \right)+cot^{-1}\left(cot\left(\pi +\frac{\pi }{6} \right) \right)\Rightarrow tan^{-1}(tan(\frac{\pi }{6}))+cot^{-1}(cot(\frac{\pi }{6}))\Rightarrow \frac{\pi }{3}6)

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1

Anuj ·2009-03-13 08:32:31

i dont know what to do of graph...[2][2][2]

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1

KR ·2009-03-13 08:35:52

let f(x)=_oâˆ«^âˆ©/2(x+sinx)dx/(1+cosx)...

i think we can get after splitting it........
and putting cosx =t;{thinking.........}

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11

Mani Pal Singh ·2009-03-13 08:37:34

@KR do read post 6&8

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KR ·2009-03-13 08:39:43

[17] [17] sorry MS , i was RENDERING EQUATION using that LATEX , it really took a lot of time..[17][17]

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1

skygirl ·2009-03-13 08:04:00

yeh pehla wala mereko koi batado kaise karte hai ....

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1

Akand ·2009-03-13 08:44:45

yup........................i told its tricky

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Subash ·2009-03-13 08:45:21

seprating it into two integrals would be the trick i think

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KR ·2009-03-13 08:46:09

[17][17]

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Mani Pal Singh ·2009-03-13 08:46:13

good catch subash
at least arent fooled by my ststement
it was just a fact and not a way to approach a problem

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1

Akand ·2009-03-13 08:48:20

wel subash there is an easier trick..........think cbse ques??

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prateek punj ·2009-03-13 08:48:39

hey akand r these just the ques by u or hav any resource that u r writting them to be coming in brds...

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11

Subash ·2009-03-13 08:50:20

well then

₀âˆ«^af(x)=₀âˆ«^af(a-x)

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Akand ·2009-03-13 08:54:38

try tht............i tried to.........u wont get it.......

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11

Subash ·2009-03-13 08:55:15

ya this is a really tricky one im not getting that way

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Akand ·2009-03-13 08:57:40

wel....try these ill giv more...............wel prateek this wasa pre board 3 q paper.......but we dint hav any preboard 3 so sir just gave it to us..

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11

Mani Pal Singh ·2009-03-13 08:58:10

i have a method but a lenghty one so find a new 1
1+cosx=2cos²x/2

i hope iske aage koi bhi kar sakta hai!!!!!!!!!!!!
(use product rule for 1)

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KR ·2009-03-13 08:58:57

by splitting we can get the right part but left part thinking.......

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Akand ·2009-03-13 09:01:04

manipal............u wer on d edge gettin a lot easier method......but missed

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ok......practice for CBSE math.....easy stuff

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