Doubtnut
1,680 old videos with fewer than 5,000 views from this channel.
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12:04
lf `vec a,vec b,vec c , vec a', vec b',vec c'`, are two sets of non-coplanar vectors such
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2:00
1. An examination consists of 8 questions in each of which one of the 5 alternatives is the c
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3:46
Let A be 2 x 2 matrix.Statement I `adj (adj A) = A`
Statement II `|adj A| = A`
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3:11
Number of 5 digit numbers which can be read in the same way from the left and from the right is
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8:44
Let `f : R - {-15 /2} - gt R - {1/2}` be defined by `f(x) = (x+10)/(2x +15)` then f(x) is
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4:33
If f and g are two decreasing function such that fog is defined, then fog will be-
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2:31
Let `x^2 - 3x + p = 0` has two positive roots a and b, then minimum value of ` 1/a + 1/b` is
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3:45
The area of the parallelogram formed by the lines `3x-4y + 1=0, 3x-4y +3=0,4x-3y-1=0` and `4x
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5:47
Let `z_1 and z_2` be two non - zero complex numbers such that `z_1/z_2+z_2/z_1=1` then the
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5:35
A and B are two points 30 m apart in a line on thehorizontal plane through the foot of a tower
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1:53
If `y=a^(a^x)` then `(dy)/(dx)=`
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If `x` be real, then the maximum value of `5+4x-4x^2` will be equal to
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2:25
One root of the following given equation `x^5-14 x^4+31 x^3-64 x^2+19 x+130=0` is
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If the complex number `z and omega` satisfies `z^3 +omega^-7=0 and z^5 * omega^11=1` then
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5:28
Min value of `a sec theta+bcostheta` is for `[theta in (-pi/2,pi/2)]`
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6:37
Three points `P, Q and R` are selected at random from the cirumference of a circle. Find the p
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9:15
`lim_(x - gt 2) (sum_(r = 1) ^n x^r - sum_(r = 1) ^n 2^r) / (x - 2)`
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Prove that the normals at the points `(1,2) and (4, 4)` of the parabola` y^2 = 4x` intersect o
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Find the equation of the tangent to the parabola `3y^2=8x`, parallel to the line x-3y = 5 .
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7:51
If the straight line ` lx+my=1` touches the curve `(ax)^n+(by)^n=1` , then show that,
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5:50
`int_0^oox^n e^(-x)dx` (n is a + ve integer) is equal to
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3:04
`tan^(-1)x + cot^(-1) (1/x) + 2tan^(-1)z =pi`, then prove that `x + y + 2z = xz^2 + yz^2 + 2xy
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One root of the cubic `2z^3-(5+ 6i)z^2 + 9iz +1-3i =0` is real. If all the three roots of thi
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1:54
The vector `p = (a*c) b-(a *b)c` is be perpendicular to