Multiple Choice Questions on If sinA 4 5 and sin5 13 then cos A B ........ for RRB(NTPC) Exam Preparation

Back to Main Page

Multiple Choice Questions

If sinA 4 5 and sin5 13 then cos A B ........

Quantitative Aptitude (RRB NTPC) Trignometry
    Download Solution PDF

    If sinA=4/5 and sin5/13 , then cos (A + B) = ?

    16/65

    Correct Answer

    63/65

    Incorrect Answer

    33/65

    Incorrect Answer

    56/65

    Incorrect Answer
    छोटे Courses बड़े Results
    Master Trignometry
    Prepare through Micro-courses
    Try Now
    Explanation:
    Given sinA = 4/5 than cosA = 3/5
    And sinB = 5/13 than cosB = 12/13
    Cos(A+B) = cosAcosB –sinA sinB
    = 3/5 x 12/13 – 4/5 x 5/13 = (36-20)/65 = 16/65

    By: Barka Mirza
    ProfileResources

    Let's Discuss

    Master
    Trignometry
    With abhipedia
    Micro Courses
    Try Now
    What our students have to say
    Review on us
    Download Abhipedia Android App

    Access to prime resources

    Downlod from playstore
    download android app download android app for free