benbuks: 1) d/dx [arccos (1-x^2)/(1+x^2) ]

2) d/dx[arccos(4x^3 - 3x)]

burst your brains with the above enigma... Should i put a prize tag?

rhydex 247:
yes put a price tag

benbuks: 1) d/dx [arccos (1-x^2)/(1+x^2) ]

2) d/dx[arccos(4x^3 - 3x)]

burst your brains with the above enigma... Should i put a prize tag?

smurfy:

No. 2

cosy = 4x^3 - 3x
-siny(dy/dx) = 12x^2 - 3

dy/dx = -(12x^2 - 3)/siny

But cos^2(y) + sin^2(y) = 1

Therefore,
dy/dx =
(3 - 12x^2)/sqrt[1 - (4x^3 - 3x)^2]

benbuks: ..rara oo...aah omo kilo dey'?

benbuks: 1) d/dx [arccos (1-x^2)/(1+x^2) ]

2) d/dx[arccos(4x^3 - 3x)]

burst your brains with the above enigma... Should i put a prize tag?

rhydex 247:
let y= arccos 4x^3-3x
also let u=4x^3-3x...du/dx=12x^2-3
y=arccosu
dy/du=1/ sqrt(1-u^2)
dy/dx=12x^2-3/sqrt(1-(4x^3-3x))

rhydex 247:
let y= arccos 4x^3-3x
also let u=4x^3-3x...du/dx=12x^2-3
y=arccosu
dy/du=1/ sqrt(1-u^2)
dy/dx=12x^2-3/sqrt(1-(4x^3-3x))

smurfy:

Wrong. Mine is correct. I want etisalat and not mtn o.

benbuks: . . . No sir, hint[Q1 put x=tan@)
Q2 put x =cos@]

benbuks: . . . No sir, hint[Q1 put x=tan@)
Q2 put x =cos@]

benbuks: Tym up.

benbuks: ok.

N100 mtn each b4 2:15pm. With solutions o.

Richiez:

very innovative of you...you're doing a good job making the thread exciting
@everyone sorry i've been off for some time now, but finally i'm back here again

Richiez:

very innovative of you...you're doing a good job making the thread exciting
@everyone sorry i've been off for some time now, but finally i'm back here again

Richiez:

very innovative of you...you're doing a good job making the thread exciting
@everyone sorry i've been off for some time now, but finally i'm back here again

smurfy: In how many different ways can the letters P, Q, R, S, T be arranged if the letter R must be to the right of the letter S?

smurfy: Why is everybody scared of tackling my simple permutation question?

I'll post it forever until... Yeah, you got it.

rhydex 247:
DO U TINK UR QUESTION ARE HARD.
MAKE I REACH HOUSE U'LL GET THE SOLN DIS NITE.

smurfy: Find dy/dx if y = {cos[cos(cosx)]}.

jauntee02: i'l give only the first person to solve this (within 12 hours) a recharge card.

1..The current distance between
Buenos Aires and Cape Town at
latitude 34° S is 6890 km, and
the sea floor spreading rate at
the South Atlantic mid-ocean
ridge (i.e. between the African
and South American plate) is 35
mm yr-1. Assuming that both
cities lie near to the edge of their
respective continental margins,
calculate to the nearest million
years how long it has been since
these two continents separated.
*****Hint: it may help if you first
calculate how far the plates
would move in 1 million years.
2..A palaeontologist has
discovered a new fossil
Pterosaur species (i.e. flying
reptile) in sedimentary strata
near Buenos Aires, and also near
Cape Town. The strata are dated
as Early Cretaceous (120 Ma) in
age. Using a reconstruction of
the fossil skeleton, the
palaeontologist has suggested
that the animal probably ate fish,
and could have flown long
distances across the sea at an
average of 60 km h-1. To the
nearest hour, determine how
long, it would have taken the
Pterosaur to fly across the Early
Cretaceous Atlantic Ocean.