prove fermat's theorem

plzz xplain d satement

the diagonal of a rectangle produces by itself the same area as produced by its both sides(i .e l and b)

from ncert 10

factorize  x^4 +16x - 12

and x^4 -16x +12

if x = 9 - 4root5

find rootx + 1/rootx

the options are:

2

4

6

9

i think none of them is coorect.plzzz post ur solns.

sunlight enters aroom at an angle of 32(deg) above the horizontal and is reflected from a plane mirror lying flat on the ground to form a spot on a wall 2.00 m behind the mirror(distance measured from the pt. of incidence).now if a pencil is placed under the edge of the mirror nearer 2 the wall ,tilting the mirror upwards by an angle 5(deg) find how higher the spot of light is formed.

Ans:26 cm(as given)

the following reaction was studied in a closed vessel:

2N₂O₅  4NO₂ + O₂

It was found dat d conc. of  NO₂ increases by 2*10^ -2mol L^-s^- in 5 seconds.

calculate the rate of change of conc. of  N₂O₅

thanx...every1...i have downloaded them

thanx...everybody...i downloaded them

i did but it didnt help,even extracted files to another folder

www.learnerstv.com is a nice site but my computer isnt supporting the file download format of the e-books(like .rar etc)

:)