Doubtnut
19,218 old videos with fewer than 5,000 views from this channel.
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2:44
Equal chords of congruent circles subtend equal angles at the centre.
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2:23
If the angles subtended by two chords of congruent circles at the
corresponding centres are ...
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2:40
IIT JEE SEQUENCES AND SERIES Coefficient of `x^(18)in(1+x+2x^2+3x^3++18 x^(18))^2`
equal to
`995`...
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1:30
IIT JEE SEQUENCES AND SERIES The greatest integer by which `1+sum_(r=1)^(30)rxxr !`
is divisible ...
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2:29
IIT JEE SEQUENCES AND SERIES `(lim)_(nvecoo)sum_(r=1)^n r/(1xx3xx5xx7xx9xxxx(2r+1))`
is equal to...
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2:17
IIT JEE SEQUENCES AND SERIES Let `S=4/(19)+(44)/(19^2)+(444)/(19^3)+ u ptooo`
. Then `s`
is equal...
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5:41
IIT JEE APPLICATION OF DERIVATIVES Let
`(a_0)/(n+1)+(a_1)/n+(a_2)/(n-1)++(a_(n-1))/2+a_n=0.`
Sh...
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4:25
IIT JEE APPLICATION OF DERIVATIVES An aeroplane is flying horizontally at a height of `2/3k m`
wi...
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6:53
IIT JEE APPLICATION OF DERIVATIVES Show that for the curve `b y^2=(x+a)^3,`
the square of the sub...
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4:28
IIT JEE APPLICATION OF DERIVATIVES The number of tangents to the curve `x^(3/2)+y^(3/2)=2a^(3/2),...
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3:30
IIT JEE RELATIONS AND FUNCTIONS Find the value of `1//x`
for the given values of `xdot`
`x gt 3`...
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4:14
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `omega`
is a cube root of unity, then find the...
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3:18
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `omega`
is a cube root of unity, then find the...
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4:16
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `((3-z_1)/(2-z_1))((2-z_2)/(3-z_2))=k(k gt 0)`...
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4:42
IIT JEE RELATIONS AND FUNCTIONS The solution set for `[x]{x}=1`
(where {x} and [x] are respectiv...
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7:40
IIT JEE RELATIONS AND FUNCTIONS Let `f(x)=([a]^2-5[a]+4)x^3-(6{a}^2-5{a}+1)x-(tanx)xsgnx`
be an e...
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5:12
IIT JEE RELATIONS AND FUNCTIONS If the graph of the function `f(x)=(a^x-1)/(x^n(a^x+1))`
is symm...
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6:55
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `a x^2+(b-c)x+a-b-c=0`
has unequal real roots...
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1:53
Let `S_n` be the sum of first `n` terms of an A.P. with non-zero common difference. Fine the rat...
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5:05
IIT JEE TRIGONOMETRIC FUNCTIONS If `A+B+C=pi`
, prove that `cotA+cotB+cotC-cos e cAdotcos e cBdot...
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2:58
IIT JEE SEQUENCES AND SERIES If `a ,b ,c`
are in A.P. and `a^2, b^2, c^2`
are in H.P., then pr...
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5:10
IIT JEE BINOMIAL THEOREM If in the expansion of `(a-2b)^n ,`
the sum of 5th and 6th terms is
0,...
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13:02
Find the eccentricity, centre, vertices, foci, minor axis, major axis, directrices and latus-rec...
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4:46
IIT JEE BINOMIAL THEOREM If the last tem in the binomial expansion of `(2^(1/3)-1/(sqrt(2)))^n i ...