Physics, Chemistry, Mathematics Forums

Sir,
Please tell me the email address to which i should mail my queries regarding evaluation of tests,and a few suggestions too.

if A and B are roots of x²+px+q=0  and A⁴ and B⁴ are the roots of

x²-rx+s=0,then the equaton   x²-4qx+2q²-r=0 ahs always :

1)2 real roots

2)2 +ve roots

3)2 -ve roots

4)one +ve and one -ve root

pleez answer soon

What is the period of sin2[sqrt(x+1)] ???
a) 2 pie
b) pie
c) pie/2
d) none of these
Also tell me all the criterias for the period of a function to change..

can anyone tell me the criteria on which the acidity of a  substance depends upon....

please see and solve it....

it is in an another topic below.

Can anyone tell me, with reasons , why most of the area under curve in a normal probability distribution is considered to lie between mu - 3 sigma and mu + 3 sigma where mu=mean of the districution and sigma=standard deviation of the distribution ?

Can anyone tell me how to compare acid nature between the following:

a)NaCl     b)NH4CN        c)NaCN        d)NH4Cl

Please tell me the method to solve such questions.

Q1:- Find the domain of the following functions:-

(a) :-  f(x) = (cos(sin x))^1/2  

(b) :-  f(x) = (sin(cos x))^1/2

Q2:- Find the range of the following function:-

         f(x) = [sin{ln((x² + e)/(x² +1))}]^1/2 + [cos{ln((x² + e)/(x² +1))}]^1/2

Is C6H5COCl named as benzene carbonyl chloride or as benzoyl chloride? plz elaborate the corresponding IUPAC rule.

find  dy/dx of

y=(root(a square + xsqu.) + root(a squ. - xsqu.))/(root a squ. + root x squ.)-(root a squ. - x squ.)