Doubtnut
18,806 old videos with fewer than 5,000 views from this channel.
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4:09
IIT JEE LIMITS AND DERIVATIVES Evaluate `lim_(n->oo)`
`[sum_(r=1)^n1/2^r]`
, where [.] deno...
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5:26
IIT JEE APPLICATION OF DERIVATIVES Find the angle at which the curve `y=K e^(K x)`
intersects th...
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2:07
IIT JEE LIMITS AND DERIVATIVES Evaluate: `("lim")_(xvec-2^+)`
`(x^2-1)/(2x+4)`
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2:52
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS Let `z`
be a complex number satisfying the equati...
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5:53
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `theta`
is real and `z_1, z_2`
are connected b...
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3:09
IIT JEE TRIGONOMETRIC FUNCTIONS If `0 lt alpha lt beta lt gamma lt pi 2,`="" then="" prove="" th...
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6:25
IIT JEE TRIGONOMETRIC FUNCTIONS Number of solution of the equation `cos^4 2x+2sin^2 2x=17(cosx+si...
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3:34
IIT JEE TRIGONOMETRIC FUNCTIONS Prove that `sin(-420^0)(c0s390^0)+cos(-660^0)(sin330^0)=-1`
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2:43
IIT JEE TRIGONOMETRIC FUNCTIONS Prove that
`(cos(90^0+theta)sec(-theta)"tan"(180^0-theta))/(sec(3...
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6:10
IIT JEE TRIGONOMETRIC FUNCTIONS Solve : `(log)_((-x^2-6x)//10)(sin3x+sinx)=(log)_((-x^2-6x)//10)(...
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5:26
IIT JEE TRIGONOMETRIC FUNCTIONS Let A,B,C, be three angles such that `A=pi/4`
and `tanB tanC=pdo...
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4:32
IIT JEE TRIGONOMETRIC FUNCTIONS For which values of a does the equation `4sin(x+pi/3)cos(x-pi/6)=...
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2:20
IIT JEE RELATIONS AND FUNCTIONS Prove that `f(x)gi v e nb yf(x+y)=f(x)+f(y)AAx in R`
is an odd fu...
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3:05
Let `A B C D`
be a parallelogram of area `124c m^2dot`
If `E`
and `F`
are the mid-points of sid...
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3:18
IIT JEE PERMUTATIONS AND COMBINATIONS Six persons A, B, C, D, E, F, are to be seated at a circula...
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2:29
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `x=1+i`
is a root of the equation `=x^3-i x+1-...
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1:44
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS The curve `y=(lambda+1)x^2+2`
intersects the cur...
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2:46
IIT JEE TRIGONOMETRIC FUNCTIONS Find the sign of the values of `tan113^0-cos107^0=a`
and `tan107^...
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1:53
Show that a median of a triangle divides it into
two triangles of equal area.
GIVEN : A ` A ...
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3:01
IIT JEE PERMUTATIONS AND COMBINATIONS How many ways are there to seat `n`
married couples `(ngeq3...
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7:36
IIT JEE TRIGONOMETRIC FUNCTIONS In triangle `A B C ,`
prove that `sin(A/2)+sin(B/2)+sin(C/2)lt=3...
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2:59
IIT JEE COMPLEX NUMBERS AND QUADRATIC EQUATIONS If `x ,y in R`
satify the equation `x^2+y^2-4x-2...
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2:56
If the diagonals `A C ,B D`
of a quadrilateral `A B C D ,`
intersect at `O ,`
and seqarate the ...
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3:05
IIT JEE TRIGONOMETRIC FUNCTIONS If `u_n=sin^("n")theta+cos^ntheta,`
then prove that `(u_5-u_7)/(u...