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Find the equation of the circle concentric with the circle 2x^2+2y^2-6x+8y+1=0and double of its area?

Posted by Shristy Chaudhary 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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Find distance of point (2,-4) from 12x‐5y‐39=0?

Posted by Avni Goyal 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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X + iy = (a+ib)/(a-ib) , prove that x² + y² =1 . (complex no. and quadratic eqn.)

Posted by Nimai Nayan 6 years, 1 month ago

CBSE > Class 11 > Mathematics

2 answers

?Garima Sharma? 6 years, 1 month ago

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Mouli Mukherjee 6 years, 1 month ago

Given, x+y i = (a+ib)/(a- ib)........(1) By conjugating both sides , we get X-- iy= (a-ib)/(a+ib).......(2) Multiplying both equations (1) and (2) , (X+ib)(x-ib) = (a+ib)/(a-ib)×(a-ib)/(a+ib) X^2+y^2 = 1 , hence proved. You can solve such questions easily by this method

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Angle b/w lines 2x-y+3and x+2y+3

Posted by Sanjeevta Devi 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Aman Singh 6 years, 1 month ago

First find slope of both equation then use formula of tan(m+n)

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Find the sum to n terms of the series: 5+11+19+29+41....

Posted by Shanya Jain 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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It is required to seat 5 men and 4 women in a row so that the women occupy the even places how many such arrangements are possible ?

Posted by ?????? ???? . 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Nimai Nayan 6 years, 1 month ago

Man can sit in 5! ways. Women can sit in 4! ways. 4! X 5! = 4x3x2x1x5x4x3x2x1 =2880 Hence they can sit in 2880 ways....

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The derivative of x^2-1 at x=10 is

Posted by Gareeb King 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Richa Sharma 6 years, 1 month ago

x^2-1 Differentiating with respect to x , we have Dy/dx=d/dx(x^2-1) Dy/dx=d/dx(x^2)- d/dx (1) =2x - 0 =2x Since x=10 therefore 2x=2*10 =20

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11.2ka

Posted by Kalesh Singh 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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We know that the sum of interior angle of triangle is 180degree . Show that sum of interior angle of the polygon having 3,4,5,6,7sides are in A.P. Find the sum of interior angle of a polygon having 21 sides.

Posted by Tanya Sharma 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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Derivation of sinx/x

Posted by Sneha Syal 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Richa Sharma 6 years, 1 month ago

sinx/x Differentiating with respect to x, we have dy/dx=x.d/dx(sinx) - sinx d/dx(x) / x^2 = xcosx - sinx /x^2

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For the parabola y=√4px find the extremities of a double ordinate of lenght 8p.prove that the lines from the vertex to its extremities are at right angles

Posted by Aman Khan 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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Basic concept of exercise 10.3

Posted by Pung Riang Riang 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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Que.3 ex 9.5 miscellaneous

Posted by Muskan Chhilar 6 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

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4 4 4 4=20 Use + × ÷ -

Posted by Shivanand Patil 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Rahul Mangla 6 years, 1 month ago

4×4×4+4

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Practical work lesson 1 2 3

Posted by Sy Yadav 6 years, 1 month ago

CBSE > Class 11 > Mathematics

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The angle between the lines x=2 and x-3y+1=0 is......... .

Posted by Chandan Subudhi 6 years, 1 month ago

CBSE > Class 11 > Mathematics

2 answers

Shivanand Patil 6 years, 1 month ago

2-3y+1=0 3y=3 y=1

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Abhinav Yadav 6 years, 1 month ago

Perhaps 120degree

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How many chords can be drawn through 21 points on a circle?

Posted by ?????? ???? . 6 years, 1 month ago

CBSE > Class 11 > Mathematics

3 answers

Ujjwal Prajapati 6 years, 1 month ago

210

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Gaurav Kumar 6 years, 1 month ago

There are 21 points on circle The chord is make only by 2 points So, Its (21)C(2) Soln, 21*20/2*1 Is 210 I hope this is useful

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Chirag Saini 6 years, 1 month ago

210

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Maths element ch 12 ex.2 q16

Posted by Raghav Bansal 6 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

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If q<0 andp>0 then p+q<p

Posted by Neeta Gautam 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Rahul Mangla 6 years, 1 month ago

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Q. Is Use of Permutations and Combination.

Posted by Lucky Papa 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Gurmandeep Singh 6 years, 1 month ago

Permutations is used for different arrangements and combinations used for group Or a selection

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Compute derivative of: f(x) =sin 2x

Posted by Manoj Meena 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Richa Sharma 6 years, 1 month ago

sin2x Differentiating w.r.t.x, we have =d/dx(sin2x) . d/dx(2x) =cos2x . 2 =2cos2x

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Find coefficient of x^12 in 4+2x-x²/(1+x)³.

Posted by Aryan Singh 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Sia ? 6 years, 1 month ago

4 + 2x - x² (1 - x³)
4 + 2x - x² (1 - x³ - 3x² + 3)
4 + 2x - x² + x⁶ + 3x⁴ - 3x²
x⁶+ 3x⁴ - 4x² + 2x + 4
so, coefficient of x¹²os 0

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Anybody can help in math

Posted by Aman? Sharma 6 years, 1 month ago

CBSE > Class 11 > Mathematics

4 answers

Gurmandeep Singh 6 years, 1 month ago

I can help u

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Raghav Bansal 6 years, 1 month ago

I think elements and jaypee mathematics

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5O75O8 Kulwant Singh Kingra 6 years, 1 month ago

Mathematics modern book

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5O75O8 Kulwant Singh Kingra 6 years, 1 month ago

Mathematics modern and pradee

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Is 3/0 a rational no.

Posted by Ajay Gupta 6 years, 1 month ago

CBSE > Class 11 > Mathematics

3 answers

Sahil Varma 6 years, 1 month ago

No 3/0 is not a rational number

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Yuvraj Singh 6 years, 1 month ago

No 3/0 is not a rationall no

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Nishtha Tripathi 6 years, 1 month ago

No 3/0 is not a rationl no.

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Where permutation and combination used

Posted by Abhishek Yadav 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Yuvraj Singh 6 years, 1 month ago

Permutations is used about no. of arrangments of anything Combination is used about no.of ways to select any thing

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No NDA papers

Posted by Abhishek Yadav 6 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Abhishek Yadav 6 years, 1 month ago

Vgdfk

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Sin(n+1)xsin(n+2)x+cos(n+1)xcos(n+2)x=cosx

Posted by Mukesh Singh 6 years, 1 month ago

CBSE > Class 11 > Mathematics

2 answers

Yuvraj Singh 6 years, 1 month ago

Taking LHS Let (n+1) = A and (n+2)=B Sin (n+1)xsin (n+2)x +cos (n+1)xcos (n+2)x=sinAxsinBx +cosAxcosBx =cos [(n+1)x - (n+2)x] =cos x (n+1-n-2) =cos(-x) =cosx

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Lucky Papa 6 years, 1 month ago

We know that, CosACosB+SinASinB=Cos (A-B) Using this Identity So, =Cos (n+2-n-1)x =Cosx=RHS Hence Proved.

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Prove :- Tan70° = Tan20° + Tan50°

Posted by Sanjana Pandey 6 years, 1 month ago

CBSE > Class 11 > Mathematics