Doubtnut
19,218 old videos with fewer than 5,000 views from this channel.
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2:10
IIT JEE TRIGONOMETRIC FUNCTIONS If the inequality `sin^2x+acosx+a^2 gt 1+cosx`
holds for any `x i...
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2:16
IIT JEE TRIGONOMETRIC FUNCTIONS If `(3pi)/4 lt alpha lt pi,t h esqrt(2cotalpha+1/(sin^2alpha))`
i...
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2:11
IIT JEE SEQUENCES AND SERIES If `(p+q)t h`
term of a G.P. is `aa n d`
its `(p-q)t h`
term is `bw ...
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1:54
IIT JEE TRIGONOMETRIC FUNCTIONS The ratio of the area of a regular polygon of `n`
sides inscribe...
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2:10
IIT JEE TRIGONOMETRIC FUNCTIONS In any triangle, the minimum value of `r_1r_2r_3//r^3`
is equal t...
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3:25
IIT JEE LOGARITHM Find the number of solutions of the following equations:
`x^(-1/2)(log)_(0. 5)...
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3:49
IIT JEE LOGARITHM Solve : `2(25)^x-5(10^x)+2(4^x)geq0.`
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5:19
IIT JEE TRIGONOMETRIC FUNCTIONS `(sin2A+sin2B+sin2C)/(sinA+sinB+sinC)i se q u a lto`
`8sin(A/2...
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5:16
IIT JEE PERMUTATIONS AND COMBINATIONS Find the ratio of `^20 C_ra n d^(25)C_r`
when each of them...
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4:26
IIT JEE PERMUTATIONS AND COMBINATIONS In how many ways can 5 girls and 5 boys be arranged in a r...
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3:29
IIT JEE PERMUTATIONS AND COMBINATIONS Find the number of words that can be made out of the lette...
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5:32
IIT JEE LIMITS AND DERIVATIVES If
`f(x)={x-1,xgeq1 2x^2-2,x lt 1,g(x)={x+1,x gt 0-x^2+1,xlt=0,a ...
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4:56
IIT JEE TRIGONOMETRIC FUNCTIONS If `2sec^2A-sec^4A-2cos e c^2A+cos e c^4A=(15)/4,t h e n`
tan A i...
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3:24
IIT JEE TRIGONOMETRIC FUNCTIONS If `cos^2A+cos^2B+cos^2C=1,t h e n A B C`
is
(a)equilateral (b)...
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5:30
IIT JEE LIMITS AND DERIVATIVES Given `("lim")_(xvec0)(f(x))/(x^2)=2,w h e r e[dot]`
denotes the g...
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5:34
IIT JEE APPLICATION OF DERIVATIVES The distance covered by a particle moving in a straight line ...
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2:07
IIT JEE APPLICATION OF DERIVATIVES Two cyclists start from the junction of two perpendicular roa...
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4:06
IIT JEE APPLICATION OF DERIVATIVES Two men `Pa n dQ`
start with velocity `u`
at the same time fr...
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4:33
IIT JEE APPLICATION OF DERIVATIVES Find the approximate value of`(0. 0037)^(1/2)`
.
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3:51
IIT JEE PERMUTATIONS AND COMBINATIONS Find the number of ways in which the birthday of six differ...
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4:08
IIT JEE PERMUTATIONS AND COMBINATIONS In how many ways can 30 marks be allotted to 8 question
i...
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1:42
IIT JEE APPLICATION OF DERIVATIVES If the radius of a sphere is measured as 9cm with an error of...
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4:48
IIT JEE APPLICATION OF DERIVATIVES In an acute triangle `A B C`
if sides `a , b`
are constants a...
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2:34
IIT JEE APPLICATION OF DERIVATIVES Find the approximate change in the volume `V`
of a cube of si...