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no value of x satisfies the given relation.hence range of x={phi}

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check if it is a spyware, by running spybot.it is free.

<do not believe on predictions..

television was invented on June 14, 1923
women started wearing pants in the 1880's in Paris.
women got short hiars in 1920s

it has been long since then therefore no point remains in saying earth wil destroy whenwhen pictures will start moving ( talks about tv) , when women will wear pants like men and will cut short their hair (today's fashion).

I ching's methd of predicting future by coins is simply a game of chance.

11 september doesn't lie within 90 days from 6 june..LOL

u told all the predictions give same date..think again these are only a few of many whose dates coincide..search on google 4 urself..

ENJOY LIFE

8.9....because of idiot part

let f(x)=sin(x/3)
g(x)=cos(x)

period of f(x)=3*2pi=6pi
period of g(x)=2pi

therefore period of gof(x)=lcm of period of f(x) and g(x)
=6pi

but there exists a real number T , smaller than 6 pi such that gof(T+x)=gof(x)

and T=3pi
gof(T+x)
=gof(3pi+x)
=cos(sin((3pi+x)/3))
=cos(sin(pi +x/3))
=cos(-sin(x/3))(since svalue of sinx/3 kies in between -1,1
=cos(sin(x/3))
=gof(x)

hence period =3pi

f(x)=0 for all x belonging to the set of real no.s is such an example.

condtant functions are periodic..why???
becos..
the value of function gets repested for every real number..with period which is not defined..

Why does the solubility of alkaline earth

metal carbonates and sulphates in water

decrease down the group?

Solution

The size of anions being much larger

compared to cations, the lattice enthalpy

will remain almost constant within a

particular group. Since the hydration

enthalpies decrease down the group,

solubility will decrease as found for

alkaline earth metal carbonates and

sulphates.

Why does the solubility of alkaline earth

metal hydroxides in water increase down

the group?

Solution

Among alkaline earth metal hydroxides,

the anion being common the cationic

radius will influence the lattice enthalpy.

Since lattice enthalpy decreases much

more than the hydration enthalpy with

increasing ionic size, the solubility

ncreases as we go down the group.

The alkaline earth metals burn in oxygen to form the

monoxide, MO which, except for BeO, have

rock-salt structure

Thermal decomposition of (NH₄)₂BeF₄ is the

best route for the preparation of BeF₂

Lithium nitrate when heated gives lithium

oxide, Li₂O, whereas other alkali metal

nitrates decompose to give the

corresponding nitrite

Lithium unlike other alkali metals forms

no ethynide on reaction with ethyne

The oxides and the peroxides are colourless

when pure, but the superoxides are yellow or

orange in colour