Doubtnut
1,680 old videos with fewer than 5,000 views from this channel.
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4:11
If `p sin alpha=qsin(12 0^(@)+alpha)=rsin(24 0^(@)+alpha)`, prove that, `pq + qr+rp = 0`.
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1:31
`o fx^3-1/(x^3),g i v e nx-1/x=4` Find the value of x3 --, given X --- == 4.x3 +
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4:07
The nth term of a series is `3^n + 2n` ; find the sum of first n terms of the series.
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1:38
`(sqrt3/sin20^@-1/cos20^@)=4`
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9:23
Prove, by induction, that `3^n gtn` for all `n in N`.
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2:18
If three numbers a, b, c satisfy the relation `(a^2 + b^2)(b^2 + c^2) = (ab + bc)^2`, show th
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4:49
`64cos^3 theta sin ^4theta=cos7theta-cos5theta-3cos3theta+3costheta`
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6:12
If `32sin^6theta=10-15cos2theta+bcos4theta+acos6theta`, show that `tan theta tan 5 theta =(a
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3:47
Find the HCF of `42x (x - 2)^2 (x - 3)^3` and `14x^2 (x - 1) (x - 2)^3`
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4:30
`f(x)=(e^x)/(e^x+sqrt(e)),"t h e n"sum_(N=1)^(1-100)f^(prime)(N)-f^(prime)(1-N)` is equal to
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2:57
interval of `alpha` for which `(alpha, alpha^2)` and `(0, 0)` lies on same side of `3x + y -
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6:04
In a tournament, team X, plays with each of the 6 other teams once. For each match the probabi
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7:11
If `a_1, a_2, a_3` are the roots of `z^3 - 3z^2 + 3z +7 = 0`, then find the value of `|sum
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3:43
find the locus of mid point of chords of circle` x^2 +y^2= 25` which subtends right angle at
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2:53
`(5costheta+csctheta)/(5costheta-csctheta)=7/3` then `cos theta =`
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1:37
Q.19 The number of boys and girls in a school are 1168 and 1095 respectively. The ratio of th
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1:27
If a worker earns Rs `18,000` in `15` months, then he earn Rs `30,000` in:
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6:06
Which of the following statements is/are true?(A) The no. of zeroes of `2^x - x^2 - 1 = 0` is
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2:11
The HCF of `36xy` and `k` is 6, then the least value of k is
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1:28
a^3 + b^3 = ?
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1:51
Fill in the Blank8. A discontinuous function `y = f(x)` satisfying `x^2 + y^2= 4` isgiven b
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3:39
If `x^2+1/x^2=17/4`, then find `x-1/x,x+1/x,x^3-1/x^3` and `x^3+1/x^3`
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2:21
Without expanding prove that `|[x+y ,z,1],[y+z,x,1],[z+x,y,1]|=0`
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4:53
`msum_(r=1)^n1/nsqrt((n+r)/(n-r))`