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a) how many 1,2,3 or 4 digit numbers can be made using the digits 1 to 4, with no digit allowed more than once? Ive done this part answer is 64 b) how many numbers less than 100 can be made? cant do this part, answer is 16 thx

lol thx I got it I did a silly mistake whilst simplifying XD

probs y'' is wrong...

y''=(-4(1+x^2)^2-2x.2(1+x^2).4x)/(1+x^2)^4

x=1/2

if you could just the second derivative part cause I got the stpt part :) thx

so how did you get it?

lol sorry yeah it is I did a typo its (1-x^2)/1+x^2) sooooooooooorrrrrrrrryyyyyyyyyyyy

yeah I have but still not getting the answer... it doesn't end up as a quadratic just another type of equation

poi of y=(1+x^2)/(1-x^2) ans: (-1/ sqr 3, 1/2) and (1/sqr 3. 1/2) st pt is (0,1) <----- I got this cant seem to get the poi though... thx

evaluate 3 integral 0 t/sqr root (t+1) dt. ans: 2 2/3

lol thx I did e^y before but I integrate with ln instead of without ln. anyways I got the answer XD ha silly mistake

Q10. find the area between the curve y=ln x, the y-axis and the lines y=2 and y=4, 3 sgn.fig. ans: 47.2 units^2 thx