Mathematics: Post your doubts here!

[smzimran]

lol its just, i never expected this paper to still be talked about

Hey, batch mate!
This thread will always be alive my friend, our batch passed and the next batch is in, one goes and another comes...

 

[parthrocks]

Plzzz show me the mthod and if possible attach a scan!!the best thing....would appreciate!!

 

[angelicsuccubus]

Haha hey! Ready for the results..?

 

[parthrocks]

anyone
smzimran
celoth
plzz help me with this question as soon as possible

 

[john10]

anyone
smzimran
celoth
plzz help me with this question as soon as possible

plz someone help. same doubt.

 

[looser]

I am appearing for ALEVELS maths in oct/nov. 2012 session. I think this site is useful, for queries. Who else among U are giving same subject in oct/nov. session?? please reply????

 

[looser]

Plzzz show me the mthod and if possible attach a scan!!the best thing....would appreciate!!

what is the ans???? to the question post it here then I will try it for showing method

 

[parthrocks]

what is the ans???? to the question post it here then I will try it for showing method

Ya sure will post it...wait.....

 

[celoth]

anyone
smzimran
celoth
plzz help me with this question as soon as possible

the 1st one:
(1/2)(cos2x-cos4x)
=(1/2)( cos(3x-x) - cos(3x+x) )
=(1/2)( cos3x cosx + sin3x sinx - (cos3x cosx - sin3x sinx ) )
=(1/2)( 2 sin3x sinx )
= sin3x sinx

 

[celoth]

anyone
smzimran
celoth
plzz help me with this question as soon as possible

for the 2nd question,
just change the (sin3x sinx) inside the integration to (1/2)(cos2x-cos4x),
then intergrate it,
and put the corresponding value into x,
you will get the answer.

 

[parthrocks]

for the 2nd question,
just change the (sin3x sinx) inside the integration to (1/2)(cos2x-cos4x),
then intergrate it,
and put the corresponding value into x,
you will get the answer.

hey bro why cant I use sin3xsinx and then integrate??i can right?

 

[looser]

Ya sure will post it...wait.....

post the ans please

 

[celoth]

hey bro why cant I use sin3xsinx and then integrate??i can right?

it will be harder to integrate

 

[looser]

it will be harder to integrate

harder to integrate and if u see in the past then whenever this type of question is given we have to integrate the proven ans in the next part.

 

[looser]

Plzzz show me the mthod and if possible attach a scan!!the best thing....would appreciate!!

celoth can u provide ans to these?? just the ans

 

[celoth]

Plzzz show me the mthod and if possible attach a scan!!the best thing....would appreciate!!

1st part,
just find the dy/dx ,
then let dy/dx=0, find x
x= 0.6065

2nd part,
do integration by parts,
by letting u= ln x , dv = x^(1/2)

 

[parthrocks]

1st part,
just find the dy/dx ,
then let dy/dx=0, find x
x= 0.6065

2nd part,
do integration by parts,
by letting u= ln x , dv = x^(1/2)

Ya i actually got it!!thanks once again.

 

[shanky631]

Plzzz show me the mthod and if possible attach a scan!!the best thing....would appreciate!!

is the ans for first part e^-2???

 

[parthrocks]

can anyone show me how t do the first part!!plz....

 

[Mustehssun Iqbal]

can anyone show me how t do the first part!!plz....

I got the solution to your question. One of the files didn't get saved. I'll have to write it again. got to wait.