Mathematics: Post your doubts here!

[applepie1996]

View attachment 23651

Anyone part (i) please

Thank you!

ummmm okay i shall try

 

[applepie1996]

View attachment 23651

Anyone part (i) please

Thank you!

its quite simple
all you need to know are the basic concepts like cos (A - B)= cos A cos B + sin A sin B
and cos (A + B)= cos A cos B - sin A sin B
soooo
cos (3x-x) = cos3x cosx - sin3x sinx
cos (3x + x) = cos3x cosx + sin 3x sinx
now you subtract these two and get 2sin3x sinx
divide it by 2
and wallah you get the answer sin3x sinx

 

[tanmaydube]

Thanks a lot applepie1996 could you do the (ii) part please

 

[unseen95]

unseen95 Here's the answer to your query of M/J/12/33 Q.5.(ii)
View attachment 23649

thank you very much

 

[applepie1996]

Thanks a lot applepie1996 could you do the (ii) part please

oh that
just replace sin3x sinx with 1/2(cos2x-cos4x)
and integrate it

 

[ahmed abdulla]

CHALLENGING QUESTION !!!

i think this question is GOING to come this year and i am 100 % sure !!
so any help ???

A ball is dropped froma height of 2m above a hard floor.
After each bounce , a ball rises to 3/4 of its previous height.

(a) how far has it travelled in total when strikes the ball for the nth term?
(b) show that the ball never travels more than 14 m in total .

i tried my best but never got it !

(a) ans is 14 - 16 * 0.75 ^n metre

 

[applepie1996]

CHALLENGING QUESTION !!!

i think this question is GOING to come this year and i am 100 % sure !!
so any help ???

A ball is dropped froma height of 2m above a hard floor.
After each bounce , a ball rises to 3/4 of its previous height.

(a) how far has it travelled in total when strikes the ball for the nth term?
(b) show that the ball never travels more than 14 m in total .

i tried my best but never got it !

(a) ans is 14 - 16 * 0.75 ^n metre

are you sure this is the question ?
maybe you are missing something
cause you can't just get 14 and 16 in the answer when the height is only 2m !

 

[SB29597]

Hi.

A curve C has the equation

a) (i) Show that:

(ii) Hence find the coordinates of the stationary point on the curve C
(iii) Show that this stationary point is a point of inflection.

 

[syed1995]

CHALLENGING QUESTION !!!

i think this question is GOING to come this year and i am 100 % sure !!
so any help ???

A ball is dropped froma height of 2m above a hard floor.
After each bounce , a ball rises to 3/4 of its previous height.

(a) how far has it travelled in total when strikes the ball for the nth term?
(b) show that the ball never travels more than 14 m in total .

i tried my best but never got it !

(a) ans is 14 - 16 * 0.75 ^n metre

Mechanics?

 

[applepie1996]

Mechanics?

yeap
i think so
it looks mechanics-ish

 

[ahmed abdulla]

Mechanics?

does it really look like its mechanics ??
did u ever find a question in mechanics to find the nth terms >>>?

 

[ahmed abdulla]

are you sure this is the question ?
maybe you are missing something
cause you can't just get 14 and 16 in the answer when the height is only 2m !

ya i am sure .... when u sum it up .. you get this exprssiom

 

[syed1995]

yeap
i think so
it looks mechanics-ish

Yea.. it seems so .. but if it were GP. The sum to infinity is 8 and not 14 and nth term would be 2(1-(3/4)^n)/(1-3/4).
2-2(0.75)^n/0.25

8-8(0.75)^n would be the answer.

 

[syed1995]

ya i am sure .... when u sum it up .. you get this exprssiom

where is the question from?

 

[applepie1996]

Yea.. it seems so .. but if it were GP. The sum to infinity is 8 and not 14 and nth term would be 2(1-(3/4)^n)/(1-3/4).
2-2(0.75)^n/0.25

8-8(0.75)^n would be the answer.

looks like its not mechanics
no wonder i couldn't get it

 

[A star]

looks like its not mechanics
no wonder i couldn't get it

i still cant get the head or tail of it

 

[ahmed abdulla]

where is the question from?

if i had my scanner working .... i would scan it .... i got a book ... and i am SURE it will come this year ... and saay i didnt tell u !!

 

[applepie1996]

i still cant get the head or tail of it

LOL xD

 

[applepie1996]

if i had my scanner working .... i would scan it .... i got a book ... and i am SURE it will come this year ... and saay i didnt tell u !!

its pure maths 1 ??

 

[Rutzaba]

hmm i thought og giving accel and i think s1 is enough of a threat i wouldnt risk with s2 . hmm the other grades would have covered up i guess

they dint -_-