DIFFERENTIATION

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is this a DONKEY's toil - work Question Or has some more Elegant - Plausible Approach to it ?? [7]

#Mathematics #Calculus

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11 Answers

21

tapanmast Vora ·2009-04-02 23:36:40

koi to try karo....

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11

rkrish ·2009-04-02 23:38:52

Did not solve completely.....but....

try putting xy = Î¸
So, (Î¸,y) â‰¡ (8,2)

Convert the entire thing to sin & cos.

I dont it'll help much.

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1357

Manish Shankar ·2009-04-02 23:40:52

let it be f(xy)=14

differentiating wrt to y

f'(xy)[(y+xdx/dy]=0

this might help

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11

rkrish ·2009-04-02 23:45:18

this is good bhaiyya ......thanx.....

Ans :comes out to be -2

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11

rkrish ·2009-04-02 23:49:42

hey.....f '(xy) is a non-zero constant at (4,2)

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21

tapanmast Vora ·2009-04-02 23:51:47

so ....

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1

vector ·2009-04-02 23:53:19

dy/dx =-y/x then it means ans is -1/2

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1

vector ·2009-04-02 23:56:14

temme wer i m wrong

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11

rkrish ·2009-04-02 23:56:24

@tapan...

f'(xy)[ydx/dy+x]=0

implies ydx/dy + x = 0

So, dx/dy = -x/y = -2

@ richa....ques is find dx/dy

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21

tapanmast Vora ·2009-04-02 23:57:37

oh k kk..... now i got y RK said f'(xy) â‰ 0

Yeah then it gets much SIMPLER.....

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vector ·2009-04-03 00:01:48

oh ya thanx

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