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tan(a+b)= ?

Posted by Varun Mishra 6 years ago

UP Board > Class 11 > गणित

3 answers

Arpit Mishra 5 years, 11 months ago

TanA+TanB/1-TanA×TanB

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Anup Yadav 5 years, 11 months ago

TanA+TanB/1-tanA.tanB

1Thank You

Vikash Verma 6 years ago

Tan(a)+tan(b) /1-tan(a)tan(b)

1Thank You

ANSWER

If tan x=1/7 and tan y=1/3 show that cos 2x =sin 4y

Posted by Deepankar Jaiswal 6 years ago

UP Board > Class 11 > गणित

1 answers

Gaurav Seth 6 years ago

Given:

tan x = 1/7

tan y = 1/3

To Prove: cos 2x = sin 4y

We know that

tan x = opposite / adjacent = 1/7

So using these value in right angle triangle ABC and Pythagoras theorem,

AC² = 1² + 7² = 1 + 49 = 50

AC = √50 = 5√2

⇒ sin x = opposite/hypotenuse = 1/5√2

⇒ cos x = adjacent/hypotenuse = 7/5√2

Also,

tan y = opposite / adjacent = 1/3

So using these value in right angle triangle LMN and Pythagoras theorem,

AC² = 1² + 3² = 1 + 9 = 10

AC = √10

⇒ sin y = opposite/hypotenuse = 1/√10

⇒ cos y = adjacent/hypotenuse = 3/√10

Now,

LHS = cos 2x = 2cos² x -1 = 2(7/5√2)² - 1 = 2(49/50) - 1

= 24/25

RHS = sin 4y = 2 sin 2y cos 2y

= 4 sin y cos y (2cos² y -1)

= 4 (1/√10)(3/√10) ( 2(3/√10)² - 1 )

= (12/10) ( 9/5 - 1 )

= (6/5) ( 4/5 )

= 24/25

LHS = RHS

Hence proved.

1Thank You

ANSWER

What is sets

Posted by Jobin George 6 years ago

UP Board > Class 11 > गणित

1 answers

Genius Boy 5 years, 11 months ago

A well defined collection of elements is called sets.

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ANSWER

(A+B)2

Posted by Dipak Kumar 6 years ago

UP Board > Class 11 > गणित

2 answers

Surya Vidhayak 4 years, 6 months ago

A+B-2AB

0Thank You

Varun Mishra 6 years ago

A^2+B^2+2AB

1Thank You

ANSWER

Sin3a

Posted by Dipak Kumar 6 years ago

UP Board > Class 11 > गणित

3 answers

Varun Mishra 6 years ago

sin3A= 3sinA-4sin^3A

0Thank You

Dipak Kumar 6 years ago

Apana whatsapp n. De do

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Vishal Maheshwari 6 years ago

Sir mai class 11 mai ka student hu michhai maths ka simple paper chahiye sir

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ANSWER

Sin@×cosec@=

Posted by मंगत सिंह मंगल सिंह 6 years ago

UP Board > Class 11 > गणित

2 answers

Varun Mishra 6 years ago

1Thank You

Dipak Kumar 6 years ago

0Thank You

ANSWER

Posted by Class 10 Ka Mathematics Kushwha 6 years, 1 month ago

UP Board > Class 11 > गणित

0 answers

ANSWER

4+4

Posted by Vikas Patel 6 years, 1 month ago

UP Board > Class 11 > गणित

3 answers

Vishal Maheshwari 6 years ago

0Thank You

Dipak Kumar 6 years ago

1Thank You

Nishant Sharma 6 years, 1 month ago

2Thank You

ANSWER

2.1

Posted by Bhanu Pratap 6 years, 1 month ago

UP Board > Class 11 > गणित

0 answers

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Y-2,2x+1

Posted by Om Tiwari 6 years, 1 month ago

UP Board > Class 11 > गणित

0 answers

ANSWER

Exercise 9.3 question 23to27

Posted by Kishor Kumar Saxena 5 years, 5 months ago

UP Board > Class 11 > गणित

1 answers

Vijay Lakshmi 6 years, 1 month ago

2Thank You

ANSWER

A={1;3}. B={1;5:9}

Posted by Abhishek Gupta 6 years, 1 month ago

UP Board > Class 11 > गणित

0 answers

ANSWER

X square + 4 x + 4

Posted by Abhishek Kumar 6 years, 1 month ago

UP Board > Class 11 > गणित

1 answers

Rajni Devi 5 years, 4 months ago

+2,-2

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Square root of 1+i

Posted by Tony Gupta 6 years, 1 month ago

UP Board > Class 11 > गणित

2 answers

Varun Mishra 6 years ago

1+√i

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Sarah ? 6 years, 1 month ago

1Thank You

ANSWER

1+i

Posted by Tony Gupta 6 years, 1 month ago

UP Board > Class 11 > गणित

0 answers

ANSWER

(x)2-(y)6

Posted by Garima Dholiya 6 years, 2 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

X²+2x+3=0

Posted by Dimpal Shaniya 6 years, 2 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

Chaptr-5

Posted by Dimpal Shaniya 6 years, 2 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

1-i

Posted by Anil Singh 6 years, 2 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

Chapter 12 maths

Posted by Manpreet Dhunna 6 years, 3 months ago

UP Board > Class 11 > गणित

1 answers

Rajni Devi 5 years, 4 months ago

YouTube pr download kro

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NCERT math book ka all chapter

Posted by Avinash Kumar 6 years, 3 months ago

UP Board > Class 11 > गणित

1 answers

Dipak Kumar 6 years ago

Bhai playstor par jao aur 'ncrt math salutation in hindi' sarch karo

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Yadi sin alpha barabar minus fantasy Kijiye ki x 45 minus 5 by 2 is equal to root MI and minus m

Posted by Pooja Pandey 6 years, 3 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

1.2 quetion 6 showe answer

Posted by Rakhi Notiyal Rakhi 6 years, 4 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

1+1

Posted by Shubham Singh Yadav 6 years, 4 months ago

UP Board > Class 11 > गणित

3 answers

Rajni Devi 5 years, 4 months ago

1Thank You

Dipak Kumar 6 years ago

0Thank You

Nitish Kumar 6 years, 4 months ago

0Thank You

ANSWER

1,2,3,4 ka gudank

Posted by Ayush Sondhiya 5 years, 5 months ago

UP Board > Class 11 > गणित

1 answers

Akhilesh Kumar 6 years, 4 months ago

Tan x

1Thank You

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Neeshu

Posted by Neeshu Pal 6 years, 6 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

Ramesh have 20books of 10%how many total books

Posted by Parshotam Singh Chauhan 6 years, 6 months ago

UP Board > Class 11 > गणित

1 answers

Nitish Kumar 6 years, 4 months ago

200

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ANSWER

Chapter 9

Posted by Anshika Sahu 6 years, 7 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

1.1

Posted by Suraj Yadav 6 years, 7 months ago

UP Board > Class 11 > गणित

0 answers

ANSWER

What is the power subset

Posted by Kanha Tarkar 6 years, 7 months ago

UP Board > Class 11 > गणित

1 answers

Nitish Kumar 6 years, 4 months ago

Fzgfysfhffgddfg get a chance to the quantity of the SI unit of amount of time to the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity total price for the SI unit of amount of time to the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the quantity of the SI of mathematics which is that branch manager SBI bank of America joined Oct 13th of April so much for your time table and chairs and tables and chairs and tables and chairs and tables and chairs and a picture of the SI unit of the day before and it will not have the same day as well and I will be in broader industry totals for each of you and the SI in the SI in the SI in

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