Doubtnut
1,097 old videos with fewer than 5,000 views from this channel.
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3:47
If is the line whose equation is `ax +by=c.` Let M be the reflection of 'L through the y-axis a...
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3:15
The P.V.'s of the vertices of a triangle are `2bari+3barj+4bark, 4bari+6barj+3bark, 3bari+2bar...
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3:05
`(sin3A+sin5A+sin7A+sin9A)/(cos3A+cos5A+cos7A+cos9A)=tan6A`
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`(6)lim_(x- gt0)(tan(a+2x)-2tan(a+x)+tana)/(x^2)`
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5:34
In an `A.P.` with first term 'a' and the common difference d `(a, d!=0)`, the ratio `'rho`' of ...
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3:44
if `cosalpha+cosbeta+cos gamma=0=sinalpha+sinbeta+sin gamma` then
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`lim_(n- gtoo)(1+sum_(k=1)^n3/(nC_k))^n`
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1:40
`intsinx**cosxdx`
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`26 xx 2=` , `45 xx 6=`
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1:49
If `a, b, c in R` and `a^2+5/2 b^2+c^2=2ab+bc+ca`, then then `a + 2b + 2c` may be
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3:46
Least integral value of x satisfying the inequation `(x^2 + 1) lt (x + 2)^2 lt 2x^2 +4x-12` is...
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11:03
Let `f(x)=(x+1)/(x+2)` . If `int ( f(x)/x^2)^(1/2) dx=1/(sqrt(2))g((sqrt(2f(x))-1)/(sqrt(2f(x...
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If `f(x)=(x-3)/(x+1)` then f[f{f(x)}] equals
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JEE MAINS 2018 JEE MAINS 2018 If `g(x)=(4cos^4x-2cos2x-1/2cos4x-x^7)^(1/7)` then the value of `g...
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2:59
Domain of : `f(x)=sqrt((1-|x|)/(2-|x|))`
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Number of solutions of equation `4 tan x + 2x = pi` belonging to interval `(-pi/2,(3pi)/2)` ar...
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Let `f(x) = x^2 + ax + b` , where `a,b in R` . If `f (x)=0` has all its roots imaginary then...
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If `A={x: x in Q and x^2 +3x-10=0}` , `B= {x:x in I and -5 lt=x lt17/8}` then show that ...
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If `theta` lies in the second quadrant, then the value `sqrt(((1-sintheta)/(1+sintheta)))+sq...
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The number of ways of selecting 6 clerks from 8 male and 7 female applicants if the selection i...
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5:19
Consider a function f defined by `f(x)=sin^(-1) sin ((x+sinx)/2) AA x in [0,pi]`which satisfies...
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The centre of variable circle `x^2+y^2+ 2gx + 2fy + c = 0` lies on the line `2x-2y +9=0` an...
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3:08
`int_1^3(& dd; x)/(x^2(x+1))=2/3+log2/3`
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13:42
If `alpha` is a root of this equation, `2 cos alpha` is a root of equation