personal59: plyz I d ans . D parametric eqn of a functn are given as y=cos 2t, x=sin t. Find expressns for dy/dx.

benbuks: dy/dt=-2sin2t
dx/dt=cost (dt/dx=1/cost)

dy/dx=dy/dt *dt/dx.
-2sin2t/cost = -4Sint.cost/cost= -4sin t

.....wana eat nw...so busy. dis days....hmm...

benbuks: dy/dt=-2sin2t
dx/dt=cost (dt/dx=1/cost)

dy/dx=dy/dt *dt/dx.
-2sin2t/cost = -4sint.cost/cost= -4sin t

.....wana eat nw...so busy. dis days....hmm...

personal59: plyz I d ans . D parametric eqn of a functn are given as y=cos 2t, x=sin t. Find expressns for dy/dx.

Pat £inst£in:

Little mistake there; sin2t = 2sint.cost

doubleDx:

No mistake bruv! Welcome to Math Clinic....

(-2)2sint.cost => -4sin(t)cos(t)

jackpot: ^^. . .and the annoying thing is that the guy used Einstein in his username. SMH >'( >'(

Pat £inst£in:

Guy check d post and not d quote, I edited d quote

Pat £inst£in:
I'm still waiting for solutions to my questions: check d previous page, or maybe @JACKPOT will help me wit dem

doubleDx:

Lol, she is actually one of the best in the clinic! I will attempt your questions when I'm free. 1luv and no beefs bruv....You are welcome!

futurewise11: a)a person wants to make annual deposits for 25 years into an ordinary annuity that earns 9.4% compounded annually in order to then make 20 equal annual withdrawals of $25,000, reducing the balance in the account to zero. How much must be deposited annually to accumulate sufficient fund to provide for this payments? How much total interest is earned during this entire 45 year process?


b) A business borrows $80,000 at 15% interest compounded monthly for 8 years. What is the monthly payment? What is the unpaid balance at the end of the first year? How much interest was paid during

these are the answer,
a) A = $2467.96; interest $438,301;
b) monthly payment $1435.63; unpaid balance at the end of the first year $74397.48;but we are to show the workings


have actually try to solve it but am arriving at something different. for ai)i got 5,562.11 using annuity/sinking fund formulae.

please great maths guru of nairaland kindly help in resolving it.

please help to resolve this misery

abdulmaliq: Pls guyz am new here, can sum1 hlp me wit dis deferential eqn.... F(x)= -6X^4+8

abdulmaliq: Pls guyz am new here, can sum1 hlp me wit dis deferential eqn.... F(x)= -6X^4+8

jackpot: Clear.


Congrats on resolving your 3-yrs old question. See the power of sharing!!!

Any other enigmas for us to brainstorm on?

Pat £inst£in:

Hmm, doc of nairaland maths clinic, solve my 3 questions na

If 'a' is the sum of odd terms and 'b' the sum of even terms in the expansion (x + a)^b , then find a^2 - b^2

The coefficient of x^4 in the expansion of (1 - x + x^2)^4 is __

Prove that tan^-1(x+z) = tan^-1(x) + 2sin(z)sin(z) - [(2sin(z))^2sin^2(z)]/2 + [(2sin(z)^3sin^3(z)]/3 - ...
Where cot(z) = x

Thanks in anticipation...

Seriously now, I'm cool wit u

benbuks: ..snap the last question.n post..

Pat £inst£in:

I'm yet to do dat bro...
and it's actually 4 questions

benbuks: ..ok..make them clearer n solvable

benbuks: ^ ok...m on bed nw..mayb i ‘d try dem 2maro...quit cheep sha.

Ortarico: Happy New Year Friends and Colleagues. Wish that New Year 2014 brings great joy, peace and prosperity, happiness and good tidings!
*puts on party hat and raises a toast to good times*