Doubtnut
581 old videos with fewer than 5,000 views from this channel.
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2:14
If |cos^(-1)(1-x^2)/(1+x^2)| ltpi/3` , then `x` belongs to the interval
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1:26
Simplify `2/3xx(15/4-:9/(-4))`
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1:59
`4(2x-3)^2 - (2x-3) -14=0`
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7:23
A circle C touches the line y = x at a point P whose distance from the origin is `4 sqrt2`. The...
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3:08
ABCD is a trapezium with AB //DC. A line parallel to AC intersects AB at point M and BC at poin...
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3:10
Show that `|[a+b+2c,a,b],[c,b+c+2a,b],[c,a,c+a+2b]|=2(a+b+c)^3`
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3:19
Let `A={x:xepsilonR,-1 ltx lt1}, B={x:xepsilonR, x lt=0 or x gt=2}` and `AuuB=R-D`, then the se...
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2:10
`sqrt(125) -4 sqrt6+ sqrt(294) - 2 sqrt(1/6)`
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3:26
Let `n=3^(100)` then for n the value of ten's digit is
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1:44
Find the direction ratios of normal to plane `3x+2y+6z=18`
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2:24
If z is a complex number, show that `|z|^2 = |z^2|`
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6:12
If the equation `ax^3-9x^2+12x-5=0` has two equal real roots then sum of all values of a is
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2:51
If `alpha +beta =3, alpha^3 + beta^3 = 7`, then `alpha` and `beta` are the roots of
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2:38
If `u=x^4`, show that `(del^3u)/(delx^2dely)=(del^3u)/(delxdelydelx)`
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4:22
if the roots of the equation px? +qx r 0, where 2p, a, 2r are in G,P, are of the form 5 a 2,4k ...
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5:35
What is rationalizing factor of `sqrt2+sqrt7+sqrt10`
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4:06
If points A(1,2) and B is (2,3). Then find point R such that AR:RB=4:3
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1:42
` ( 3 sin 12^@ -4 sin^3 12^@)/(8 cos^3 6^@ - 6 cos 6^@)`
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1:53
`(2x-(7-5x))/(9x-(3+4x))=7/6`
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2:18
let `f={(1,1),(2,3),(0,-1),(-1,-3)}` be a linear function from the set `{1,2,0,-1}`.
Find f(X...
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1:15
`2+2=`
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3:40
Let A, B, C be distinct subsets of a universal set U. For a subset X of U, let X' denotes the c...
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6:24
`int(dx)/(1+x^3)`
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2:13
to)A bookseller has 420 science stream books and 130 art stream books. He wants to stack them i...