NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Jaison
Subject: Maths
, asked on 28/3/18
1/(1-cos theta +2i sin theta) please convert it in x+iy form
Answer
1
Lavneesh Rajput
Subject: Maths
, asked on 28/3/18
Solve this :
131. The value of cos 20
o
-
2
cot 20
o
is
(a) 0 (b) -1
(c) 2 (d) 3
Answer
2
Kshitij Gaur
Subject: Maths
, asked on 25/3/18
Prove that: [DO NOT GIVE ANY LINKS]
(Sin 4A + Sin 8A)/(Cos 4A+Cos 8A) = Tan 6A
Answer
1
Manveen Kaur
Subject: Maths
, asked on 24/3/18
solve 13-15
Q13. Prove that tan
–1
x =2 tan
–1
(cosec tan
–1
x –tan cos
–1
x )
Q14. Solve for x : sin
–1
x + sin
–1
2x –
π
3
Q15. If cos
–1
x > sin
–1
x ,then find x.
Answer
1
Manveen Kaur
Subject: Maths
, asked on 24/3/18
Solve this :
Q. Find the sum of the series :
tan
-
1
1
2
.
1
2
+
tan
-
1
1
2
.
2
2
+
tan
-
1
1
2
.
3
2
+
.
.
.
.
.
.
.
.
.
.
.
∞
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 22/3/18
No links please
Q. (iii) If f (x) =
1
-
sin
x
π
-
2
x
2
,
w
h
e
n
x
≠
π
2
K
,
w
h
e
n
x
=
π
2
Find the value of K for which f (x) is continuous at x =
π
2
.
Ans :
1
2
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 20/3/18
No links please
Q. If
x
=
2
cos
θ
-
cos
2
θ
;
y
=
2
sin
θ
-
sin
2
θ
; find the value of
d
2
y
d
x
2
a
t
θ
=
π
2
Answer
1
Varnika Dhiman
Subject: Maths
, asked on 20/3/18
I wanna know if the way of writing things is correct or not. I doubt on those marked step. So lemme know if we can write in that way or not.
Answer
1
Tarul Jhalani
Subject: Maths
, asked on 20/3/18
Q. If the roots of
x
3
+
p
x
2
+
q
x
+
p
=
0
a
r
e
α
,
β
,
γ
. Prove that (except one situation)
tan
-
1
α
+
tan
-
1
β
+
tan
-
1
γ
=
n
π
and find the situation when it does not happen.
Answer
1
Tarul Jhalani
Subject: Maths
, asked on 20/3/18
Q.23.
sin
2
cos
-
1
c
o
t
2
tan
-
1
x
=
0
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/3/18
No links please
Q.(i) Find the equation to the curve passing through (2, 2) and having its slop
-
x
+
y
x
at the point (x, y).
4 b. (i) Ans : x (x + 2y) = 12
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/3/18
No links please
Q.(ii) The Cartesian equations of a line are x = ay + b, z = cy + d. Find its direction ratios.
2.d (ii) Ans : < a, 0, c >
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/3/18
No links please
Q.(i) If
p
→
is a unit vector and
x
→
-
p
→
.
x
→
+
p
→
=
8
; find
x
→
2.d. (i) Ans : 3
Answer
2
Tarul Jhalani
Subject: Maths
, asked on 19/3/18
Q
.
I
f
ϕ
=
tan
-
1
x
3
2
K
-
x
a
n
d
θ
=
tan
-
1
2
x
-
K
K
3
t
h
e
n
P
r
o
v
e
t
h
a
t
v
a
l
u
e
o
f
ϕ
-
θ
=
30
°
Answer
1
Tarul Jhalani
Subject: Maths
, asked on 19/3/18
18:
18. Prove tha : t
tan
-
1
1
2
tan
2
A
+
tan
-
1
c
o
t
A
+
tan
-
1
c
o
t
3
A
=
0
Answer
1
Prev
2
3
4
5
6
Next
What are you looking for?
131. The value of cos 20o - cot 20o is
(a) 0 (b) -1
(c) 2 (d) 3
(Sin 4A + Sin 8A)/(Cos 4A+Cos 8A) = Tan 6A
Q13. Prove that tan–1 x =2 tan–1 (cosec tan–1x –tan cos–1x )
Q14. Solve for x : sin–1 x + sin–1 2x –
Q15. If cos–1 x > sin–1x ,then find x.
Q. Find the sum of the series :
Q. (iii) If f (x) =
Find the value of K for which f (x) is continuous at x = .
Ans :
Q. If ; find the value of
Q. If the roots of . Prove that (except one situation) and find the situation when it does not happen.
Q.(i) Find the equation to the curve passing through (2, 2) and having its slop at the point (x, y).
4 b. (i) Ans : x (x + 2y) = 12
Q.(ii) The Cartesian equations of a line are x = ay + b, z = cy + d. Find its direction ratios.
2.d (ii) Ans : < a, 0, c >
Q.(i) If is a unit vector and ; find
2.d. (i) Ans : 3
18. Prove tha : t