NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Aashish Rohilla
Subject: Maths
, asked on 26/12/17
write the integrating factor for solving the differential equation cosydx=(secy -xsiny)dy
Answer
1
Shreya Dey
Subject: Maths
, asked on 24/12/17
check whether the following differential equation is homogeneous or not:
x
2
(dy/dx) -xy=1+cos(y/x), x not equal to 0
find the general solution of the differential equation using substitution y=vx
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 20/12/17
Dear Expert,
I exam is near and I am facing problem in a number of sums. I have posted them in the ask and answer forum but nearly one day have passed but experts haven't answered them. So, please answer the unanswered questions asked by me as soon as possible because my exam is very near. And please do not give any links to the questions unless the linked question exactly matches with the o
ne asked by me.
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 20/12/17
NO LINKS PLEASE
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 20/12/17
PLEASE DO GIVE ANY LINKS
Answer
3
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
No links please.
Chapter - Tangent and normal
12. If the straight line lx +my+n=0 touches the
iv) ellipse
x
2
a
2
+
y
2
b
2
=
1
,
show that a
2
l
2
+b
2
m
2
= n
2
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
No links please.
Chapter - Tangent and normal
12. If the straight line lx +my+n=0 touches the
iii) parabola y
2
=4ax, prove that am
2
=nl
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
No links please.
Chapter - Tangent and normal
12. If the straight line lx +my+n=0 touches the
i) circle x
2
+y
2
=a
2
, show that a
2
(l
2
+m
2
)=n
2
ii)circle x
2
+y
2
+2gx+2fy+c=0 , show that (l
2
+m
2
)(g
2
+f
2
-c)=(gl+fm-n)
2
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
Tangent and Normal
12. If the straight line lx+my+n=0 touches the :
(i) circle
x
2
+
y
2
=
a
2
,
s
h
o
w
t
h
a
t
,
a
2
(
l
2
+
m
2
)
=
n
2
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
Tangent and Normal
11. Find the equation of the tangent, perpendicular to the line x+2y=0, to the hyperbola
7
x
2
-
4
y
2
=
28
and find the coordinates of the point of contact.
Ans: 2x-y=3, point of contact (8/3,7/3) and 2x-y+3=0, point of contact (-8/3,-7/3)
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
Tangent and Normal
Find the equations of the tangents to the ellipse
x
2
+
3
y
2
=
4
which are perpendicular to the line 3x+y=7,
Ans:
x
-
3
y
=
±
4
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
Find the equation of the tangent to the parabola
y
2
= 8
x
at the point (2
t
2
, 4
t
) . Hence, find the equation of the tangent to this parabola, perpendicular to
x
+ 2
y
+ 7 = 0.
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
No links, please
chapter- tangent and normal
8- Find the equation of the tangents to the circle x
2
+y
2
=81, which are perpendicular to the line 4x+3y=0
Ans- 3x-4y
±
45=0
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
Tangent and Normal
7. Find the equation of the tangents to the ellipse
2
x
2
+
3
y
2
=
30
, which are parallel to the straight line x+y+18=0
Ans:
x
+
y
±
5
=
0
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 19/12/17
Find the equation of the tangent to the parabola 3
y
2
= 8
x
,
parallel to the line
x –
3
y
= 5.
Answer
1
Prev
4
5
6
7
8
Next
What are you looking for?
x2 (dy/dx) -xy=1+cos(y/x), x not equal to 0
find the general solution of the differential equation using substitution y=vx
I exam is near and I am facing problem in a number of sums. I have posted them in the ask and answer forum but nearly one day have passed but experts haven't answered them. So, please answer the unanswered questions asked by me as soon as possible because my exam is very near. And please do not give any links to the questions unless the linked question exactly matches with the one asked by me.
NO LINKS PLEASE
PLEASE DO GIVE ANY LINKS
Chapter - Tangent and normal
12. If the straight line lx +my+n=0 touches the
iv) ellipse show that a2l2+b2m2 = n2
Chapter - Tangent and normal
12. If the straight line lx +my+n=0 touches the
iii) parabola y2=4ax, prove that am2=nl
Chapter - Tangent and normal
12. If the straight line lx +my+n=0 touches the
i) circle x2+y2=a2 , show that a2(l2+m2)=n2
ii)circle x2+y2+2gx+2fy+c=0 , show that (l2+m2)(g2+f2-c)=(gl+fm-n)2
12. If the straight line lx+my+n=0 touches the :
(i) circle
11. Find the equation of the tangent, perpendicular to the line x+2y=0, to the hyperbola and find the coordinates of the point of contact.
Ans: 2x-y=3, point of contact (8/3,7/3) and 2x-y+3=0, point of contact (-8/3,-7/3)
Find the equations of the tangents to the ellipse which are perpendicular to the line 3x+y=7,
Ans:
chapter- tangent and normal
8- Find the equation of the tangents to the circle x2+y2=81, which are perpendicular to the line 4x+3y=0
Ans- 3x-4y 45=0
7. Find the equation of the tangents to the ellipse , which are parallel to the straight line x+y+18=0
Ans: