Determinants DIBY Maths by Sachin Sir provides comprehensive coverage of determinants, essential for students preparing for JEE Mains and IIT JEE Advanced exams. This resource includes detailed explanations, example problems, and solutions to help learners grasp complex mathematical concepts. Ideal for high school students and aspiring engineers, it focuses on key topics and problem-solving strategies. The guide is structured to enhance understanding and improve exam performance, making it a valuable tool for effective study.

Key Points

  • Covers fundamental concepts of determinants for JEE preparation
  • Includes example problems and detailed solutions for practice
  • Focuses on problem-solving strategies and techniques
  • Designed for high school students aiming for engineering entrance exams
Sujal Ayush
Author:Sachin Sir
34 pages
Language:English
Type:Study Guide
Sujal Ayush
Author:Sachin Sir
34 pages
Language:English
Type:Study Guide
368
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DETERMINANTS
MATHEMATICS
DIBY (DO IT BY YOURSELF)
By: Sachin Jakhar (Defender Mamu)
JEE MAINS & IIT JEE ADVANCED
# DIBY-01
The cofactor of the element 4 in the determinant
is
(A) 4 (B) 10 (C) 10 (D) 4
[Ans. : (B)]
# DIBY-02
If
, then can not be (where
 and
󰇛
  󰇜
(A)
(B)
(C)
(D)
[Ans. : (C)]
# DIBY-03
If
 
, then cofactors of the elements of second row are
(A) 39, 3, 11 (B) 39, 3, 11 (C) 39, 27, 11 (D) 39, 3, 11
[Ans. : (C)]
# DIBY-04
The solution set of the equation


 
, is [IIT-JEE-1981]
[Ans. :  ]
# DIBY-05
If
and

are the cofactors of

, then






is equal to
(A) 8 (B) 6 (C) 4 (D) 0
[Ans. : (A)]
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End of Document
368

FAQs

What is the cofactor of the element '4' in a given determinant?
The cofactor of the element '4' in the determinant
1 3 5 1
2 3 4 2
8 0 1 1
0 2 1 1
is calculated to be 10, as indicated in the solution provided in the document.
How do you find the cofactors of the second row elements in a specific matrix?
For the matrix A =
5 6 3
-4 3 2
-4 -7 3,
the cofactors of the elements in the second row are determined to be -39, 27, and 11. This calculation is detailed in the document, showcasing the process of finding cofactors.
What is the solution set for the equation given in the determinant format?
The solution set of the equation represented by the determinant
1 4 20
1 -2 5
1 2x 5x
2 = 0 is found to be x = -1 and x = 2. This result is derived from the analysis presented in the document.
What value does the determinant yield for a specific matrix involving 'A'?
The value of the determinant A =
2 -1 0 1
0 0 1 -2
3 1 -1 1
0 -1 5 0
is calculated to be -45, as specified in the document. This highlights the importance of determinants in matrix analysis.
How is the determinant involving 'b' and 'c' structured?
The determinant structured as
b + c c b
c c + a a
b a a + b
is equal to k(abc), where the value of k is determined to be 4 according to the findings in the document.
What does the determinant involving 'A' and 'B' equal?
The value of the determinant involving matrices A and B is calculated as sec²A + sec²B - sin²2A, yielding a result of 2. This calculation is detailed in the document, emphasizing the relationships between trigonometric functions and determinants.
What is the determinant of the matrix involving 'a', 'b', and 'c'?
The value of the determinant
a a + b b
a + 2b a a + b
a + b a + 2b a
is shown to be 9b²(a + b). This result is derived from the analysis of determinants presented in the document.