03 మాత్రికలు
వ్యాయామం 03
Question:
Find 1/2(A+) and 1/2(A−), when A=
Answer:
- Find AT:
AT =
- Find 1/2(A + AT):
1/2(A + AT) =
- Find 1/2(A - AT):
1/2(A - AT) =
Question:
If A= and B=, then verify that (i)=+ (ii)=−
Answer:
(i) A+B =
(A+B)T =
AT =
BT =
AT + BT =
Therefore, (A+B)T = AT + BT
(ii) A-B =
Question:
If (i) A=, then verify that A′A=I (ii) A=, then verify that A′A=I
Answer:
(i) A’A =
Since cos2α + sin2α = 1, A’A =
which is the identity matrix I.
(ii) A’A =
Since sin2α + cos2α = 1, A’A =
which is the identity matrix I.
Question:
Find the transpose of each of the following matrices: (i) (ii) (iii)
Answer:
(i)
(ii)
(iii)
Question:
If A=, then A+A′=I, if the value of α is A π/6 B π/3 C n D 3π/2
Answer:
A π/6
A=
A′=
A+A′=
A+A′=
Therefore, A+A′=I and the value of α is A π/6.
Question:
For the matrices A and B, verify that (AB)′=B′A′ where (i) A=,B= (ii) A=,B=
Answer:
(i) A=, B=
Step 1: Calculate AB
Step 2: Calculate (AB)′
Step 3: Calculate B′
Step 4: Calculate B′A′
Therefore, (AB)′=B′A′.
(ii) A=, B=
Step 1: Calculate AB
Step 2: Calculate (AB)′
Question:
For the matrix A=, verify that (i) (A+A′) is a symmetric matrix (ii) (A−A′) is a skew symmetric matrix.
Answer:
(i) To verify that (A+A′) is a symmetric matrix, we need to show that it is equal to its transpose.
A+A′ =
=
A′+A =
=
Since A+A′ = A′+A, it is a symmetric matrix.
(ii) To verify that (A−A′) is a skew symmetric matrix, we need to show that it is equal to its negative transpose.
A−A′ =
=
A′−A = <math xmlns = “http://www.w3.org/1998
Question:
If A,B are symmetric matrices of same order, then AB−BA is a , A Skew symmetric matrix B Symmetric matrix C Zero matrix D Identity matrix
Answer:
Answer: C Zero matrix
Question:
Express the following matrices as the sum of a symmetric and a skew symmetric matrix: (i) (ii) (iii) (iv)
Answer:
(i)
Symmetric Matrix:
Skew Symmetric Matrix:
(ii)
Symmetric Matrix:
Skew Symmetric Matrix:
(iii)
Question:
(i) Show that the matrix A= is a symmetric matrix (ii) Show that the matrix A= is a skew symmetric matrix.
Answer:
(i) A matrix A is symmetric if A = AT, where AT is the transpose of A.
Let A =
Then, AT =
Since A = AT, the matrix A is symmetric.
(ii) A matrix A is skew symmetric if A = -AT, where AT is the transpose of A.
Let A =
Then, AT =
Since A = -AT, the matrix A is skew symmetric.
Question:
If A′= and B=, then verify that: (i)(A+B)′=A′+B′ (ii)(A−B)′=A′−B′
Answer:
(i) To verify that (A+B)′=A′+B′, we need to calculate (A+B)′ and A′+B′ separately and then compare them.
(A+B)′ =
A′+B′ =
Since (A+B)′=A′+B′, we can conclude that (i) is true.
(ii) To verify that (A−B)′=A′−B′, we need to calculate (A−B)′ and A′−B′ separately and then compare them.
(A−B)′ =
A′−B′ =
Since (A−B)′=A′−B′, we can conclude that (ii) is true.
Question:
If A′= and B=, then find (A+2B)′.
Answer:
Step 1: Add A and 2B to get (A + 2B) A + 2B =
Step 2: Find the transpose of (A + 2B) (A + 2B)′ =
JEE స్టడీ మెటీరియల్ (గణితం)
01 సంబంధాలు మరియు విధులు
02 విలోమ త్రికోణమితి విధులు
03 మాత్రికలు
04 నిర్ణాయకాలు
05 కొనసాగింపు మరియు భిన్నత్వం
- వ్యాయామం 01
- వ్యాయామం 02
- వ్యాయామం 03
- వ్యాయామం 04
- వ్యాయామం 05
- వ్యాయామం 06
- వ్యాయామం 07
- వ్యాయామం 08
- ఇతర వ్యాయామాలు
06 డెరివేటివ్ల అప్లికేషన్
07 సమగ్రతలు
08 ఇంటిగ్రల్స్ యొక్క అప్లికేషన్
09 వెక్టర్స్
10 త్రీ డైమెన్షనల్ జ్యామితి
11 లీనియర్ ప్రోగ్రామింగ్
12 సంభావ్యత