how to get 100 in maths class 12 board exam 2014

cos[tan-1{sin(cot-1 x)}] = [(1 + x^2)/(1 - x^2)]^-1

prove it!!!! 

What do you mean by idempotent matrix?explain with example.

(tan^{-1 _x})²+ (cot-^1_x)²= 5 pi²/ 8

find value of x

if * is a binary operation on R defined by a*b= a+b+ab. prove that * is commutative and associative. find the idebtify element. also show that every element of R is invertible wxcept -1.

Let N denote the set of all natural numbers and R be the relation on N X N defined by

( a,b ) R ( c,d ) both sided arrow ad ( b + c ) = bc ( a + d )

Prove that R is an equivalence relation on N x N.

1. Show that the relation R defined by R={(a,b):a-b is divisible by 3;a,b E N}is an equivalence relation .

what are real numbers?

what are natural numbers?

what are integers?

what is difference between them?

tell thm in detail with examples 

how to calculate the number of binary  operations on any set A , say of 4 elements?

11. Let A=QxQ.Let * be a binary operation on A defined by : (a,b)*(c,d) = (ac,ad+b).Find i) Identity element of (A,*) ii) the invertible element of (A,*).

Show that the function f : R -- R defined by

f(x) =x / x² +1 , ( x belongs R)

is neither one-one nor onto....

1] if cos-1 x/2 + cos-1 y/3 = theta, then prove that 9x2 - 12xy cos theta + 4y2 = 3b sin square theta .

2] simplify : cos-1 (3/5 cos x + 4/5 sin x )

3] if tan-1 a + tan-1 b + tan-1 c = pie , then prove that a + b + c = a.b.c

4] prove:

a) 2 tan-1 x = tan-1 ( 2x/ 1 - x2 )

b) sec2 ( tan-1 2 ) + cosec2 ( cot-1 3 ) = 15

Is it necessary that fo(g+h) is always equal to (fog) + (foh)? Explain using an example.

how to prove that a given function is onto?

what is trivially transitive relation.

let f; N-R be a function defined as f(x) = 4x²+12x +15. show that F:N - S where s is the range of f , is invertible. find the inverse of f.

Please post answers of r.s. aggarwal of class 12 mathematics

Chapters are as follows :

1.relation and function

2. matrices

3. determinants

 LET A BINARY OPERATION*IS DEFINED BY a*b=ab/5 for all a,b belongs R-{0} THEN FIND THE VALUE x given by 2*(x*5)=10

difference between all india and delhi cbse

If y=(x+root(x^2+a^2))^n, prove that dy/dx=ny/(root(x^2+a^2)).

if any two function f and g : R→ R

f(x) = 3x+4

and gof(x) = 2x-1

then find g(x) ?????

Let * be a binary operation on Q⁺ defined by a*b=ab/100 for all a,b belongs to Q⁺.The inverse of 0.1 is?

Please tell me the chapter wise marks distribution in physics, chemistry, and maths in boards...

1. The first three terms of an AP are respectively 3y-1, 3y+5 and 5y+1. Then calculate the value of y.

Prove that the function f: NN, defined by f(x) = x² + x+1 is one one but not onto.

Find whether f:Z - Z defined by f(x) = x² + 5 for all x belongs Z is one one or not.

show that the function f: R ---->R given by f(x)=x³ + x is a bijection.

which is the best maths guide book for class XII(CBSE)

Show that the function f: R-->R defined by f(x)= 3x^3+ 5 for all x belongs to R is bijective.

Consider f: R+ → [−5, ∞) given by f(x) = 9x² + 6x − 5. Show that f is one one,onto hence invertible

Show that each of the relation R in the set A = {х Z :0 ≤ x ≤ 12} ,given by R ={(a,b) : | a-b| is a multiple of 4 is an equlance relarion . Find the set of elements related to 1

solution in the text book could not be followed kindly explain in detail.

if the binary operation * on the set Z of integers is defined by a * b = a + b -5, then write the identity element for the operation * in Z

Every arbitrary equivalence relation R in a set X divides X into mutually disjoint subsets (A_i) called partitions or subdivisions of X satisfying the following conditions:

• All elements of A_i are related to each other for all i

   Sir , I can't under stand the line means. Plz explain in brief.

 How is aggregate calculated in CBSE report card of class 12th, if the Medical student has Maths as optional subject and Physical education is additional?

Find domain of 10^x+10^y =10.

1. Show that f:N=N given be f(x)={x+1, if x is odd
2. x-1, if x is even } is bijectve .

the binary operation *:R x R--->R is defined as a*b=2a+b.Find (2*3)*4

Are equations of tangent and normal to parabola whether x2 =4ay or y2 =4ax is same...???

Is ther no differnce in sign...??

write the smallest equivalence relation R on set A ={1, 2, 3} .

let f:z-z:f(n)=3n and let g:z-z defined by

g(n)=n/3 if n multiple of 3

0 if n is not a multiple of 3

show that gof=Iz and fog not =Iz

for the set A={1,2,3} define the relation R in set A as follows:

R={(1,1) (2,2) (3,3) (1,3)}. write the ordered pairs to be added to R to make it the smallest equivalent relation.

If y root(x2+1)=log(root(x2+1)-x), show that (x2+1) dy/dx+xy+1=0

In a college of 300 students,every student reads 5 newspaper and every newspaper is read by 60 students. what is the number of newspaper???

 Show that the relation (R) defined by (a,b)R(c,d) -> a+d=b+c on the set N X N is an equivalence relation

pls someone solve these problems

1. show that f:R-R defined by f(x) = 2x³ -7 for all x belonging to R is bijective

2. f(x) = x+7 g(x) = x-7 x belonging to R find (fog)(7)

3.f(x) = x³ g(x)= cos3x find fog(x)

4.f:R-R f(x) = x/x² +1 find f (f (x))

5. f:R-R f(x) = x² - 3x + 2 find f (f (x))

6.f(x) = mode x  g(x) = [x] f:R-R find  fog(5/ 2) gof ( - square root 2)  where [ greatest integer function]

let f:n-n defined by f(x)= n+1/2, if n is odd

n/2, if n i even

state whether f is bijective ?

i know how to prove that f is 1-1 . i need help for if f is onto or not ..