Doubtnut
1,097 old videos with fewer than 5,000 views from this channel.
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10:02
Let F be the foot of perpendicular and I be the image of the point (2, -3) with respect to the ...
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4:03
If one of the lines represents by `3x^2-4xy+y^2=0` is perpendicular to one of the line `2x^2-5...
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2:07
The equation is true for `(12x+1)/4=(15x-1)/5 + (2x-5) /(3x-1)`
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3:48
Let A and B be two non empty subsets of set X such that A is not a subset of B, then:
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2:46
`f(x)=(sinx-xcosx)/(x^2)` if `x !=0` and f(0)=0 then `int_0^1 f(x) dx` is
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3:02
If `f(x)=x^2+bx+c` and `f(2+t)=f(2-t)` for all real number t, then which of the following is tr...
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3:49
Find the values of p for which the equation `1+p sinx=p^2-sin^2x` has a solution
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3:54
`3/(1. 2)xx1/(2^2)+4/(2. 3)xx1/(2^3)+5/(3. 4)xx1/(2^4)...oo` is equal to `a/b` in lowest form o...
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12:46
If a, b, c are distinct positive real numbers in G.P and `log_ca, log_bc, log_ab` are in A.P, ...
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6:08
Let `f(x)=(sqrt(log(x^2+k x+k+1)))/(x^2+k)` If f(x) is continuous for all `x in R` then the ran...
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3:02
If the expansion `2cos10^@+sin100^@+sin1000^@+sin10000^@` is simplified then its value is
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4:15
The most general values of `theta` satisfying the two equations `costheta=-1/sqrt2 , tan theta=...
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4:59
the solution set of the inequality `(3^x-4^x).ln(x+2)/(x^2-3x-4) leq0`
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4:32
Let A be the complete solution set of `sqrt(-x^2 +8x-15)/sqrt(1-4{x}) geq0` and B be the comple...
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8:29
`sin3theta=4sinthetasin2thetasin4theta` in `0 lt=theta lt=pi` has
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3:22
If `f(alpha)=[[1,alpha,alpha^2],[alpha,alpha^2,1],[alpha^2,1,alpha]]` then find the value of `f...
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2:27
If `(x_1-x_2)^2+(y_1-y_2)^2 =a^2`, `(x_2-x_3)^2+(y_2-y_3)^2=b^2`, `(x_3-x_1)^2 +(y_3-y_1)^2=c^2...
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5:19
The value of K so that the equation `(K+ 1 )sinx + 2cosx = 2 + K` has at least one solution is
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4:43
If `a+ b= 3-cos 4theta` and `a-b= 4 sin 2theta`, then ab is always less than or equal to
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2:58
If `x^3f(x)=sqrt(1+cos2x)+|f(x)|, (-3pi)/4 ltx lt(-pi)/2` and `f(x)=(alphacosx)/(1+x^3)` , then...
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6:48
The values of x, satisfying the equation `x^2 - 3 - {x} = 0`
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4:05
The projection of the vector `veca=4i-3j+2k` On the vector making equal angles (acute) with coo...
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2:16
If two adjacent sides of a square are represented by the vectors `xveci+vecj+4veck` and `3veci+...
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4:56
`(dy)/(dx)=(x+y+1)/(2x+2y+3)`