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WBJEE: Important Questions and Preparation Tips – Trigonometric Functions

Nov 28, 2017 11:03 IST
    WBJEE 2018: Trigonometric Functions
    WBJEE 2018: Trigonometric Functions

    In this article, the engineering section of Jagranjosh brings chapter notes of chapter Trigonometric Functions including detailed information about all important topics like definition of angle, relation between degree and radian, trigonometric identities (reciprocal, quotient, even/odd, Pythagorean, co-function etc), law of sines, law of cosines, formula of area of triangles etc.

    These notes are prepared by experienced Subject Experts after the detailed analysis of the latest syllabus and previous year papers of WBJEE examination.
    In these notes, all important concepts, formulae and some previous year solved questions are also included which will help WBJEE aspirants to understand the difficulty level of the questions which can be asked in coming WBJEE examination.

    About the Exam:

    West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

    WBJEE: Important Questions and Preparation Tips – Hyperbola

    Important Concepts:

    WBJEE Trigonometric Functions

    WBJEE: Important Questions and Preparation Tips – Ellipse

    Some previous year solved questions are given below:

    Question 1:

    WBJEE Trigonometric Functions Q1

    Solution 1:

    WBJEE Trigonometric Functions S1

    Hence, the correct option is (A).

    WBJEE: Important Questions and Preparation Tips – Probability

    Question 2:

    WBJEE Trigonometric Functions Q2

    Solution 2:

    WBJEE Trigonometric Functions S2

    Hence, the correct option is (C).

    WBJEE: Important Questions and Preparation Tips – Permutation and Combination

    Question 3:

    In a ΔABC, tanA and tanB are the roots of pq(x2 + 1) = r2x. Then ΔABC is

    (A) a right angled triangle

    (B) an acute angled triangle

    (C) an obtuse angled triangle

    (D) an equilateral triangle

    Solution 3:

    We have equation, pq(x2 + 1) = r2x.

    So, pqx2 – r2x + pq = 0

    tanA and tanB are the roots of the above equation

    Product of roots = tanA. tanB = pq/pq = 1

    tanA tanB = 1

    So, tan(A+B) is undefined

    => ∠C = π / 2

    So, ABC is right angled triangle.

    Hence, the correct option is (A).

    WBJEE: Important Questions and Preparation Tips – Sequence and Series

    Question 4:

    WBJEE Trigonometric Functions Q4

    Solution 4:

     WBJEE Trigonometric Functions S4

    Hence, the correct option is (b).

    WBJEE: Important Questions and Preparation Tips – Relations and Functions

    Question 5:

    In a ΔABC, a,b,c are the side of the triangle opposite to the angles A,B,C respectively. Then the value of a3sin(B–C) + b3 sin(C–A) + c3sin(A–B) is equal to

    (A) 0

    (B) 1

    (C) 3

    (D) 2

    Solution 5:

    By using sine law and 3A formula, the value of

    a3sin(B–C) + b3 sin(C–A) + c3sin(A–B) = 0

    Hence, the correct option is (A).

    WBJEE 2018: Notification, Application, Dates, Eligibility, Exam Pattern, Syllabus

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