Doubtnut
1,680 old videos with fewer than 5,000 views from this channel.
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4:16
The geometrical mean between the smallest and greatest distance of the point `P (10,7)` from t
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3:33
If the altitude of an equilateral triangle is `12sqrt3 cm`, find its perimeter and area.
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6:09
Coefficient of `x^m` in `(1 +x)^m+ (1+ x)^(m+1)+........ (1+ x)^n, m lt n` is
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7:52
If the normals at the points P Q, R with eccentric angles `alpha, beta, gamma` on the ellipse
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3:43
if `int_(-pi/2)^(pi/2) (sin^3x+cos^3x)dx`
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3:21
Let `S={a,b,c}epsilonNxxNxxN:a+b+c=21,a lt=b lt=c}` and T={(a,b,c)epsilon NxxNxxN :a,b,c are i
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3:14
if `n! =40320` then `n`
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3:05
if `.^(12)P_6+6.^(12)P_5=^(13)P_n ,` then `n`
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8:33
The value of `sum_(n=0)^1sum_(i=1rlepi)^n nC_r sC_r` is
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4:38
if `lim_(x- gtoo) (1+lambda/x+mu/x^2)^(2x)=e^2` then
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1:33
The equation `x^3-yx^2+x-y= 0` represents
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3:15
Find the zeros of each of the following quadratic polynomials and verify the relationship betw
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3:03
If `f^1 (x)=1/(1+(lnx)^2) and y=f(e^(tanx))` then `(dy)/(dx)` is equal to
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2:14
Number of ways of selecting 10 students out of 40 boys and 60 girls is
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4:25
`|x-1| +|x-2|+|x-3|=k
`
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8:51
Find the number of 7 lettered words each consisting of 3 vowels and 4 consonants which can be
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1:30
Express the following algebraic quantities as difference of two squares. `(x+y+2z)(x+y)`
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7:10
If `t_r=2^(r/3)+2^(-r/3)`, then `sum_(r=1)^100 (t_r)^3-3sum_(r=1)^100 (t_r)+1`=
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2:52
Suppose `'a'` is a fixed real number such that `(a-x)/(p x)=(a-y)/(q y)=(a-z)/(r z)` if `p,q,
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3:54
If `x^2-2xcos theta+1=0`, then the value of `x^(2n)-2x^n cosntheta+1, n in N` is equal to
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3:13
`int(e^(2x-1)-e^(1-2x))/(e^(x+2))dx`
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11:09
The area enclosed by the curve `y = (x-1) (x-2) (x-3)` between the coordinate axes and the ord
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6:32
Let `f` be a polynomial function such that `f(3x)=f'(x);f''(x),` for all `x in R.` Then :
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3:28
Solve the following differential equation `(dy)/(dx)+ycotx=sin2x`