Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Mathematics

If y = `[(f(x), g(x), h(x)),(l, m,n),(a,b,c)]`, prove that `dy/dx = |(f'(x), g'(x), h'(x)),(l,m, n),(a,b,c)|`.

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

y = e^x + 1  :  y″ – y′ = 0

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

y = x² + 2x + C  :  y′ – 2x – 2 = 0

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

y = cos x + C : y′ + sin x = 0

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

`y sqrt(1 + x^2) : y' = (xy)/(1+x^2)`

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

y = Ax : xy′ = y (x ≠ 0)

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

y = x sin x : xy' = `y + x  sqrt (x^2 - y^2)`  (x ≠ 0 and x > y or x < -y)

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

xy = log y + C :  `y' = (y^2)/(1 - xy) (xy != 1)`

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

y – cos y = x :  (y sin y + cos y + x) y′ = y

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

x + y = tan^–1y   :   y² y′ + y² + 1 = 0

Verify that the given function (explicit or implicit) is a solution of the corresponding differential equation:

`y = sqrt(a^2 - x^2 )  x in (-a,a) : x + y  dy/dx = 0(y != 0)`

The number of arbitrary constants in the general solution of a differential equation of fourth order are ______.

The number of arbitrary constants in the particular solution of a differential equation of third order are ______.

Find the general solution of the differential equation `dy/dx + sqrt((1-y^2)/(1-x^2)) = 0.`

Show that the general solution of the differential equation  `dy/dx + (y^2 + y +1)/(x^2 + x + 1) = 0` is given by (x + y + 1) = A (1 - x - y - 2xy), where A is parameter.

Solve the differential equation `[e^(-2sqrtx)/sqrtx - y/sqrtx] dx/dy = 1 (x != 0).`

Find a particular solution of the differential equation `dy/dx + y cot x = 4xcosec x(x != 0)`, given that y = 0 when `x = pi/2.`

Show that the function given by f(x) = sin x is

1. strictly increasing in `(0, pi/2)`
2. strictly decreasing in `(pi/2, pi)`
3. neither increasing nor decreasing in (0, π)