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    • Posted by Thakur Deepanshu Tomar 6 years, 6 months ago

    UP Board > Class 11 > भौतिक विज्ञान
    • 0 answers
    ANSWER

    • Posted by Nehal Khan 6 years, 6 months ago

    UP Board > Class 11 > लेखाशास्त्र
    • 1 answers

    Satyam Rajput 6 years, 3 months ago

    Good

    2Thank You

    ANSWER

    • Posted by Electronic Projects319121 6 years, 6 months ago

    UP Board > Class 11 > भूगोल
    • 2 answers

    Pankaj Nishad 5 years, 2 months ago

    Iretastha nees hai

    0Thank You

    जनमेजय तिवारी 6 years, 5 months ago

    Iretasthanees

    1Thank You

    ANSWER
    34

    • Posted by Vishal Saubari 6 years, 6 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Manish Rajbhar 6 years, 6 months ago

    3,2

    0Thank You

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    • Posted by Varun Mishra 6 years, 6 months ago

    UP Board > Class 11 > गणित
    • 3 answers

    Arpit Mishra 6 years, 5 months ago

    TanA+TanB/1-TanA×TanB

    1Thank You

    Anup Yadav 6 years, 6 months ago

    TanA+TanB/1-tanA.tanB

    1Thank You

    Vikash Verma 6 years, 6 months ago

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

    1Thank You

    ANSWER

    • Posted by Talha Ali 6 years, 7 months ago

    UP Board > Class 11 > English
    • 1 answers

    Thakur Deepanshu Tomar 6 years, 6 months ago

    11th

    3Thank You

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    • Posted by Ravi Kant 6 years, 7 months ago

    UP Board > Class 11 > जीव विज्ञान
    • 0 answers
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    • Posted by Deepankar Jaiswal 6 years, 7 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Gaurav Seth 6 years, 7 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 Aman Virat 6 years, 7 months ago

    UP Board > Class 11 > जीव विज्ञान
    • 2 answers

    Amayra Siddiqui 6 years, 2 months ago

    Cell is the fundamental and structural unit of life

    2Thank You

    Gaurav Seth 6 years, 7 months ago

    Cell was discovered by an English Botanist, Robert Hooke in 1665. He used self-designed microscope to observe cells in a cork slice back then.

    Cells are called the structural and functional unit of life because all the living organisms are made up of cells and all the functions that take place inside the organisms are performed by cells.

    4Thank You

    ANSWER

    • Posted by Nikita Singh 6 years, 7 months ago

    UP Board > Class 11 > English
    • 0 answers
    ANSWER

    • Posted by Vipin Sharma 6 years, 7 months ago

    UP Board > Class 11 > English
    • 2 answers

    Ankit Singh 5 years, 7 months ago

    How vas

    0Thank You

    Neelam Maurya 6 years, 6 months ago

    Neeraj

    0Thank You

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    • Posted by Sunilkumar Kamal 6 years, 7 months ago

    UP Board > Class 11 > English
    • 0 answers
    ANSWER

    • Posted by Arjun Rana 6 years, 7 months ago

    UP Board > Class 11 > भौतिक विज्ञान
    • 0 answers
    ANSWER

    • Posted by Mustakeem Saifi 6 years, 7 months ago

    UP Board > Class 11 > लेखाशास्त्र
    • 0 answers
    ANSWER

    • Posted by Jobin George 6 years, 7 months ago

    UP Board > Class 11 > गणित
    • 1 answers

    Genius Boy 6 years, 5 months ago

    A well defined collection of elements is called sets.

    1Thank You

    ANSWER

    • Posted by Monika Pal 6 years, 7 months ago

    UP Board > Class 11 > अर्थशास्त्र
    • 0 answers
    ANSWER

    • Posted by Sumit Raw 6 years, 7 months ago

    UP Board > Class 11 > English
    • 0 answers
    ANSWER

    • Posted by Golu Singh 6 years, 7 months ago

    UP Board > Class 11 > लेखाशास्त्र
    • 1 answers

    Praful Dubey 6 years, 6 months ago

    HERE!! Bookkeeping is the recording of financial transactions, and is part of the process of accounting in business. Transactions include purchases, sales, receipts, and payments by an individual person or an organization/corporation. Did u get it?

    1Thank You

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    • Posted by Dipak Kumar 6 years, 7 months ago

    UP Board > Class 11 > गणित
    • 2 answers

    Surya Vidhayak 5 years ago

    A+B-2AB

    0Thank You

    Varun Mishra 6 years, 6 months ago

    A^2+B^2+2AB

    1Thank You

    ANSWER

    • Posted by Dipak Kumar 6 years, 7 months ago

    UP Board > Class 11 > गणित
    • 3 answers

    Varun Mishra 6 years, 6 months ago

    sin3A= 3sinA-4sin^3A

    0Thank You

    Dipak Kumar 6 years, 7 months ago

    Apana whatsapp n. De do

    0Thank You

    Vishal Maheshwari 6 years, 7 months ago

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

    1Thank You

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    • Posted by Sahil Chaudhary 6 years, 7 months ago

    UP Board > Class 11 > शारीरिक शिक्षा
    • 0 answers
    ANSWER

    • Posted by Shubham Yadab 6 years, 7 months ago

    UP Board > Class 11 > हिंदी जनरल
    • 1 answers

    Himanshu Kumar 6 years, 5 months ago

    Kadir das

    0Thank You

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    • Posted by Shubham Yadab 6 years, 7 months ago

    UP Board > Class 11 > हिंदी जनरल
    • 0 answers
    ANSWER

    • Posted by Rachit Baghel 6 years, 7 months ago

    UP Board > Class 11 > English
    • 1 answers

    Rachit Baghel 6 years, 7 months ago

    Who are you punish

    0Thank You

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    • Posted by Chandra Kumar 6 years, 7 months ago

    UP Board > Class 11 > इतिहास
    • 0 answers
    ANSWER

    • Posted by मंगत सिंह मंगल सिंह 6 years, 7 months ago

    UP Board > Class 11 > गणित
    • 2 answers

    Varun Mishra 6 years, 6 months ago

    1

    1Thank You

    Dipak Kumar 6 years, 7 months ago

    1

    0Thank You

    ANSWER

    • Posted by Tarun Chauhan 6 years, 7 months ago

    UP Board > Class 11 > हिंदी जनरल
    • 0 answers
    ANSWER
    Ok

    • Posted by Class 10 Ka Mathematics Kushwha 6 years, 7 months ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Saima Akram 6 years, 7 months ago

    UP Board > Class 11 > English
    • 0 answers
    ANSWER

    • Posted by Saima Akram 6 years, 7 months ago

    UP Board > Class 11 > English
    • 1 answers

    Shirajul Hoque 6 years, 7 months ago

    Hauryou

    1Thank You

    ANSWER

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