CBSE > Class 11 > Mathematics | CBSE Board | Homework Help

Let g.p as (a ar ar^2 ar^3.............ar^n-1) acc.to quest. Total no. Of terms is even....okk so....now....what will be the terms occupying odd place..it will be T1 , T3 , T5.......so on..T1 is a T3 is ar T4 is ar^2....okk???then find sum of odd terms ...by the formula a(r^n -1)/r-1....similarly find total of all terms and do as given in question..if u get any other problem then u can ask....actually it is not possible to solve all the question here okk??

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How we can solve this (cos x + cos y) square + ( sin x + sin y ) square = 4cos square(x+y÷ 2)

Posted by Dharna Saini 7 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Ram Kushwah 7 years, 1 month ago

LHS = cos² x + cos² y + 2 cos x cos y + sin² x + sin²y + 2 sin x sin y

        =   2 + 2 ( cos x cos y + sin x siny )

        = 2 ( 1 + cos ( x - y ) )

        = 2 * 2 cos²( ( x - y ) / 2 ) (because 1.+ cos x=2cos²x / 2 )

        = 4 cos² ( (x - y ) / 2 ) = RHS

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Finda the coefficient of X pow5 in (x+3)pow8

Posted by Maithreyan Prabhu 7 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Sakshi?? Dubey 7 years, 1 month ago

First find r =3 ,the coefficient of x power 5 = 1512

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Find the modulus argument and the principle argument of the complex number 1)-. i-1÷i(1-cos2π÷5) +sin2π÷5

Posted by Rishabh Chauhan 7 years, 1 month ago

CBSE > Class 11 > Mathematics

3 answers

Sakshi?? Dubey 7 years, 1 month ago

0 ans

0Thank You

Rishabh Chauhan 7 years, 1 month ago

Thanks ,but this isn't right answer

0Thank You

Praveen Prajapati 5 years, 9 months ago

2Thank You

ANSWER

Lim = xsinx/x x--1

Posted by Arf Kadr 7 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Nancy Rajput 7 years, 1 month ago

i dont understand your question

1Thank You

ANSWER

(a+b) whole cube

Posted by Kiran Sharma 7 years, 1 month ago

CBSE > Class 11 > Mathematics

4 answers

Sivan Karthick 7 years, 1 month ago

a^3+b^3+3ab (a+b)

0Thank You

Himanshu Soni 7 years, 1 month ago

a^3+b^3+3a^2b+3ab^2

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Yakshi ? 7 years, 1 month ago

Use binomial theorem......???....well....shriya is right

1Thank You

Shriya Gupta 7 years, 1 month ago

a^3+b^3+3ab(a+b)

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The mean and standard deviation of a group of 100 observations were found to be 29 and 5 respectively.later on it was found that three observations were incorrect wgich were recorded as21,23,and 28.find the mean abd standard deviation if the incorrect observations are omittes

Posted by Amit Pilania 7 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Sinx-7/6

Posted by Puran Pal Singh 7 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Formula of ch 1 to 15

Posted by Mohit Ruhil 7 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Find a point on the x-axis,which is equidistant from the points (7,6) and (3,4).

Posted by Aditya Sharma 7 years, 1 month ago

CBSE > Class 11 > Mathematics

7 answers

Sakshi?? Dubey 7 years, 1 month ago

A point is (15/2,0) find by the distance formula

0Thank You

Yakshi ? 7 years, 1 month ago

Is it clear now???

1Thank You

Yakshi ? 7 years, 1 month ago

U will not use mid point formula......u have to use distant formula....let all three points as P Q and R .as these two point are equidistant....so.....find distance of PQ and then QR and put them equal and solve u will get answer

4Thank You

Yakshi ? 7 years, 1 month ago

Yes i was wrong....now.....let me tell u correct one.....only last method was wrong....

3Thank You

Yakshi ? 7 years, 1 month ago

I could be wrong.....i m not sure sorry???

3Thank You

Yakshi ? 7 years, 1 month ago

The point which we need to find is on x axis which means y=0....okk???now let the coordinates be(x,0)...this point is eqidistant from those points so....u can use mid point formula i.e. x1 + x2 /2 = x so,.....7+3 /2=x so....x will be 5......

2Thank You

Manju Mali 7 years, 1 month ago

I don't know the answers plz ask from your teacher.....

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ANSWER

Hey guys...whats up

Posted by Lovely Dhawan 7 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Differentiation of 2^x with respect to x

Posted by Rashi 7Th 7 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Ramesh Sahu 7 years, 1 month ago

2^xln2

1Thank You

ANSWER

Jhhb

Posted by Shitij Rana 7 years, 1 month ago

CBSE > Class 11 > Mathematics

5 answers

Yakshi ? 7 years, 1 month ago

2Thank You

Ankit Singh 7 years, 1 month ago

????

1Thank You

???. Pragati 7 years, 1 month ago

Well I know these types of disturbing elements???

1Thank You

Yakshi ? 7 years, 1 month ago

Haha!!!!avneet he wants to make us fool!!!???

3Thank You

???. Pragati 7 years, 1 month ago

1Thank You

ANSWER

Lim X-->infinity x/√x+√x+√x

Posted by Poonam Yadav 7 years, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Ramesh Sahu 7 years, 1 month ago

Infinity

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ANSWER

Find eq. Of ellipse whose axis are parallel to coordinate axes having it center at point (2,-3) and one factor at (3,-3) and one vertex is (4,-3)

Posted by Sewak Singh Legha 7 years, 1 month ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

1*2^2+2*3^2+3*4^2..........to n term

Posted by Nalin Anand 7 years, 1 month ago

CBSE > Class 11 > Mathematics

3 answers

Yakshi ? 7 years, 1 month ago

I know it is lengthy but ....if u will read it step by step u will find it....easy

3Thank You

Yakshi ? 7 years, 1 month ago

And after finding nth term multiply nth terms of both of them...then u will get....n(n^2) which will give u n^3 and then...taking summation ....as sigma n^3 apply formula and u will get answer

2Thank You

Yakshi ? 7 years, 1 month ago

As given in question.....1×2^2 + 2×3^2...firstly separate the no.s in multiplication ....u can write....(1+2+3........)(2^2 + 3^2 + 4^2.........)then find nth term of each...u will get nth term of (1+2+3.....)=n and nth term of other one will be....n^2

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If line 3x- ay -1 =0 is parallel to the line (a+2)x-y+3=0 then find the value of a.

Posted by Zarrin Bano 7 years, 1 month ago

CBSE > Class 11 > Mathematics