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    • Posted by Varun Mishra 5 years, 2 months ago

    UP Board > Class 11 > गणित
    • 3 answers

    Arpit Mishra 5 years, 1 month ago

    TanA+TanB/1-TanA×TanB

    1Thank You

    Anup Yadav 5 years, 2 months ago

    TanA+TanB/1-tanA.tanB

    1Thank You

    Vikash Verma 5 years, 2 months ago

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

    1Thank You

    ANSWER

    • Posted by Deepankar Jaiswal 5 years, 2 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Gaurav Seth 5 years, 2 months 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

    • Posted by Jobin George 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Genius Boy 5 years, 1 month ago

    A well defined collection of elements is called sets.

    1Thank You

    ANSWER

    • Posted by Dipak Kumar 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 2 answers

    Surya Vidhayak 3 years, 8 months ago

    A+B-2AB

    0Thank You

    Varun Mishra 5 years, 2 months ago

    A^2+B^2+2AB

    1Thank You

    ANSWER

    • Posted by Dipak Kumar 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 3 answers

    Varun Mishra 5 years, 2 months ago

    sin3A= 3sinA-4sin^3A

    0Thank You

    Dipak Kumar 5 years, 3 months ago

    Apana whatsapp n. De do

    0Thank You

    Vishal Maheshwari 5 years, 3 months ago

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

    1Thank You

    ANSWER

    • Posted by मंगत सिंह मंगल सिंह 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 2 answers

    Varun Mishra 5 years, 2 months ago

    1

    1Thank You

    Dipak Kumar 5 years, 3 months ago

    1

    0Thank You

    ANSWER
    Ok

    • Posted by Class 10 Ka Mathematics Kushwha 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER
    4+4

    • Posted by Vikas Patel 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 3 answers

    Vishal Maheshwari 5 years, 3 months ago

    8

    0Thank You

    Dipak Kumar 5 years, 3 months ago

    8

    1Thank You

    Nishant Sharma 5 years, 3 months ago

    8

    2Thank You

    ANSWER
    2.1

    • Posted by Bhanu Pratap 5 years, 3 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Om Tiwari 5 years, 4 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Kishor Kumar Saxena 4 years, 7 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Vijay Lakshmi 5 years, 3 months ago

    F

    2Thank You

    ANSWER

    • Posted by Abhishek Gupta 5 years, 4 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Abhishek Kumar 5 years, 4 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Rajni Devi 4 years, 7 months ago

    +2,-2

    0Thank You

    ANSWER

    • Posted by Tony Gupta 5 years, 4 months ago

    UP Board > Class 11 > गणित
    • 2 answers

    Varun Mishra 5 years, 2 months ago

    1+√i

    0Thank You

    Sarah ? 5 years, 4 months ago

    0

    1Thank You

    ANSWER
    1+i

    • Posted by Tony Gupta 5 years, 4 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Garima Dholiya 5 years, 4 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Dimpal Shaniya 5 years, 5 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Dimpal Shaniya 5 years, 5 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER
    1-i

    • Posted by Anil Singh 5 years, 5 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Manpreet Dhunna 5 years, 5 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Rajni Devi 4 years, 7 months ago

    YouTube pr download kro

    0Thank You

    ANSWER

    • Posted by Avinash Kumar 5 years, 5 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Dipak Kumar 5 years, 3 months ago

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

    0Thank You

    ANSWER

    • Posted by Pooja Pandey 5 years, 6 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Rakhi Notiyal Rakhi 5 years, 6 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER
    1+1

    • Posted by Shubham Singh Yadav 5 years, 7 months ago

    UP Board > Class 11 > गणित
    • 3 answers

    Rajni Devi 4 years, 7 months ago

    2

    1Thank You

    Dipak Kumar 5 years, 3 months ago

    2

    0Thank You

    Nitish Kumar 5 years, 6 months ago

    2

    0Thank You

    ANSWER

    • Posted by Ayush Sondhiya 4 years, 7 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Akhilesh Kumar 5 years, 6 months ago

    Tan x

    1Thank You

    ANSWER

    • Posted by Neeshu Pal 5 years, 9 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Parshotam Singh Chauhan 5 years, 9 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Nitish Kumar 5 years, 6 months ago

    200

    0Thank You

    ANSWER

    • Posted by Anshika Sahu 5 years, 9 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER
    1.1

    • Posted by Suraj Yadav 5 years, 10 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Kanha Tarkar 5 years, 10 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Nitish Kumar 5 years, 6 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

    0Thank You

    ANSWER

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