CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

a polynomial is an expression consisting of variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables. An example of a polynomial of a single indeterminate, x, is x² − 4x + 7.

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If A, B and C are interior angles of a triangle ABC, then show that sin [ B + C / 2 ] = cos A/2.

Posted by Saipreet . 5 years, 7 months ago

CBSE > Class 10 > Mathematics

5 answers

Lucifer ? Morningstar? 5 years, 7 months ago

Then proved that sin[B+C/2]=cosA/2

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Lucifer ? Morningstar? 5 years, 7 months ago

And sin(90°-A/2)= CosA/2

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Lucifer ? Morningstar? 5 years, 7 months ago

Dividing both side by 2 ||. B+C/2=90°-A/2

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Lucifer ? Morningstar? 5 years, 7 months ago

We know that,A+B+C=180° ||. B+C=180°-A

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Saipreet . 5 years, 7 months ago

???

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3.1 me pehla question

Posted by Lalit Garg Kumar Deshraj 5 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

? ????? ?????? ? 5 years, 7 months ago

Available on this app...

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Use Euclid's division algorithm to find the hcf of 867 and 225

Posted by Pratyush Biswal 5 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Avani Singh 5 years, 7 months ago

By using euclid division algorithm , The ans is _ 1. 867>225 2. 867= 225 × 3 +192. R is not equals to 0 Tgen again apply euclid divison lemma 3. 225 = 192 × 1 + 33 4. 192 = 33 × 5 + 27 5. 33 = 27 × 1 + 6 6. Finally ,27= 6 × 4 + 3 7 .At last 6 = 3 × 2 + 0 Here fiannly in 7 step R is equals to zero then the HCF of 867 and 225 is 2 Hope it help

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Kamatchi M 5 years, 7 months ago

It is 3

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If d is the HCF of 52 and 72, find x,y satisfying d=56x+72y.Also, show that x and y are not unique.

Posted by Deepanshi Yadav 5 years, 7 months ago

CBSE > Class 10 > Mathematics

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The HCF and LCM of two numbers are 9 and 90 respectively. If one number is 18 ,find the other

Posted by Soumya Ang 5 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Deepanshi Yadav 5 years, 7 months ago

Let the other no. be 'x' , then according to the formula The product of LCM and HCF of two numbers = product of the numbers.So, 9*90=18*x x=9*90÷18 x=810÷18=45 The other no. is 45

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How to get 95percent marks in board CBSE 2021

Posted by Monojit Saha 5 years, 7 months ago

CBSE > Class 10 > Mathematics

4 answers

Monojit Saha 5 years, 4 months ago

How to get success in Cricket

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Monojit Saha 5 years, 4 months ago

How to get 100% marks in CBSE board exam 2021 class 10

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Usha Rani 5 years, 7 months ago

To get 95 percent first always be confident that you can do anything. Then you just clear all topics of all the subjects after that u just revise all the models from all the chapters. And then after completing text book and notes u just revise previous years question papers. It won't give 95 percent but it will cover some 70 percent of questions.

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... ... 5 years, 7 months ago

Just clear ur all doubts....n go throughly through ncert books...don't even leave any topic of ncert books...after completing ncert book...if u want, then u can also study from side books ?....but according to me, ncert is the best book...

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Chapter 1st exercise 1.4 question number 2 you please explain

Posted by Durgesh Kumar Singh 5 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Deepanshi Yadav 5 years, 7 months ago

From the question no.1 we have to find the decimal expansion of only those numbers which have a terminating decimal expansion For example 13÷3125 is terminating , then we have to find its decimal expansion It can be written as 13÷5^5 and then we will multiply 2^5 upside and down 13*2^5÷5^5*2^5 13*b32÷10^5 416÷10^5 0.00416

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Prove that 1/2+√3 is irrational number

Posted by Jyotsna Thakur 5 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Jaspreet Singh 5 years, 7 months ago

Can you prove that √3 is irrational? If you can, sum of rational and irrational is irrational

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Prof. Arunava Biswas 5 years, 7 months ago

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Show that 10×9×8×5×2+2×8 is a composite no.

Posted by Shikha Jain 5 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Jaspreet Singh 5 years, 7 months ago

Here you write this no by taking 2 or 8 anything common as i write by taking 2 common 2(10×9×8×5+8) So now 2 is also a factor of this given no. So this no has more than 2 factors, hence it is a composite number.

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Find mean for x: 10 12 14 16 18 20 f: 3 5 6 4 4 3

Posted by Nitin Jothi 5 years, 7 months ago

CBSE > Class 10 > Mathematics

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Find teh remainder when p(x)=x3-6x2+2x-4 whsn divided by 1-2x

Posted by Nidhi Gupta 5 years, 7 months ago

CBSE > Class 10 > Mathematics

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Find the quadratic polynomial whose zero are 2r -6 verify the relation between the coefficient and the zeros of polynomial

Posted by Deepak Shahi 5 years, 7 months ago

CBSE > Class 10 > Mathematics

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Two candles of equal height but different thickness are lighted the first burn off in 6 hours and the second in 8 hours how long after lighting both will first candle be half the height of seconds

Posted by Anko Singla 5 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Lucifer ? Morningstar? 5 years, 7 months ago

Let height of each candle = x unit. First candle burns off in 6 hours. Second candle burns off in 8 hours. Height of 1st candle after burning for 1 hr = x6unit and height of 2nd candle after burning for 1 hr = x8unit Let the required time =y hrs. Length of 1st candle burnt after y hrs = y×x6unit Height of 1st candle left = (x−xy6) Length of 2nd candle burnt after y hrs = (y×x8)unit Height of 2nd candle left = (x−xy8) According to the question, Height of 1st candle = 12×Height of 2nd candle ⇒x−xy6=12(x−xy8) ⇒x(1−y6)=12x(1−y8) 1−y6=12(1−y8) ⇒2−y3=1−y8 2−1= y3−y8 1 = 8y−3y24 ⇒ 24=5y ⇒ y= 245 y=4.8hours=4 hours 48 minutes.

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Use Euclid division lemme to show that the cube of any positive into integers in of the following 9 and 9 + 1

Posted by Vishal Singh 5 years, 7 months ago

CBSE > Class 10 > Mathematics