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Integrals
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Integrals
TEST : 4
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q1.
∫
1
1
−
x
√
d
x
is equal to
A.
-2
1
−
x
−
−
−
−
√
+
C
B.
1
−
x
−
−
−
−
√
+ C
C.
2
1
−
x
−
−
−
−
√
+
C
D.
3
x
−
2
−
−
−
−
√
+
C
View Solution
Add Work Space
Answer :
Option A
Explaination / Solution:
∫
(
1
−
x
)
−
1
/
2
d
x
=
(
1
−
x
)
1
/
2
(
1
/
2
)
(
−
1
)
+ C
=
−
2
1
−
x
−
−
−
−
√
+ C
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q2.
An antiderivative of
x
cos
2
x
is equal to
A.
Cot x + C
B.
x tanx + C
C.
x tanx + log |cosx| + C
D.
x cosx + log |tanx| + C
View Solution
Add Work Space
Answer :
Option C
Explaination / Solution:
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q3.
∫log x dx is equal to
A.
1
2
(
log
x
)
2
+ C
B.
x + logx + C
C.
x log x – x + C
D.
1/x + C
View Solution
Add Work Space
Answer :
Option C
Explaination / Solution:
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q4.
If f (x) be a function such that
d
d
x
(
f
(
x
)
)
=
log
x
,
then f (x) is equal to
A.
x
log
(
x
e
)
+ C
B.
x
log
(
e
x
)
+ C
C.
log
x
x
+ C
D.
x log (x e) + C
View Solution
Add Work Space
Answer :
Option A
Explaination / Solution:
Integrating both sides, we get
∫
d
d
x
(
f
(
x
)
)
d
x
=
∫
log
x
d
x
w
e
g
e
t
f
(
x
)
=
∫
log
x
d
x
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q5.
∫
f
′
(
x
)
f
(
x
)
√
d
x
is equal to
A.
f(x) + C
B.
log ( f(x) ) + C
C.
1
2
log
|
f
(
x
)
|
+ C
D.
2√f(x) + C
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
∫
f
′
(
x
)
f
(
x
)
d
x
=
∫
(
f
(
x
)
)
−
1
/
2
f
′
(
x
)
d
x
=
(
f
(
x
)
)
1
/
2
1
/
2
+
C
=
2
f
(
x
)
−
−
−
−
√
+
C
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q6.
∫
log
(
1
x
−
1
)
dx is equal to
A.
1
2
log
(
2
−
x
)
+
C
B.
log 2x + C
C.
(x−1)log(1−x)+1−xlnx+C
D.
(3x+1)log(2+x)+1−xln2x+C
View Solution
Add Work Space
Answer :
Option C
Explaination / Solution:
∫
l
o
g
(
1
−
x
)
d
x
−
∫
log
x
d
x
⇒
(
x
−
1
)
log
(
1
−
x
)
+
1
−
x
ln
x
+
C
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q7.
∫
(
log
(
log
x
)
+
(
log
x
)
−
1
)
dx is equal to
A.
x log (log x)
−
x
log
x
+ C
B.
x
−
log
2
x
−
1
x
+
2
+
C
C.
x log (log x) +
x
log
x
+ C
D.
x log (log x) + C
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q8.
Which of the following is not equal to
∫
−
1
1
−
x
2
√
d
x
A.
cos
−
1
x
+ C
B.
-
cos
−
1
x
+ C
C.
−
sin
−
1
x
+
C
D.
(
s
e
c
x
)
(
cos
−
1
x
)
(
c
o
s
x
)
+
C
View Solution
Add Work Space
Answer :
Option B
Explaination / Solution:
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q9.
∫
(
1
−
cos
x
)
cos
e
c
2
x
dx is equal to
A.
3
cot
2
x
3
+
C
B.
cot
x
2
+
C
C.
tan
x
2
+
C
D.
1
2
tan
x
+
C
View Solution
Add Work Space
Answer :
Option C
Explaination / Solution:
# Integrals
# CBSE 12th Mathematics
Prepare / Learn
Q10.
∫
x
2
+
a
2
−
−
−
−
−
−
√
d
x
is equal to
A.
Standard Formulae Can be done by By-Part taking '1' as the second function and
a
2
+
x
2
−
−
−
−
−
−
√
as first function.
B.
tan
−
1
(
x
2
+
x
+
2
)
+
C
C.
D.
View Solution
Add Work Space
Answer :
Option A
Explaination / Solution:
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