Doubtnut
18,806 old videos with fewer than 5,000 views from this channel.
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5:38
IIT JEE TRIGONOMETRIC FUNCTIONS `cot16^0cot44^0+cot44^0cot76^0-cot76^0cot16^0`=
(a)`1`(b)` 2`
...
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1:20
JEE MAINS 2018 Solve the following equation for `x` :
`3sin^(-1)(2x)/(1+x^2)-4cos^(-1)(1-x^2)/(...
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3:14
JEE MAINS 2018 Find the equation of the line passing through the
point `(1,-1,1)`
and perpend...
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3:03
IIT JEE SEQUENCES AND SERIES If `a_1, a_2, a_3, `
be terms of an A.P. if `(a_1+a_2++a_p)/(a_1+a_2...
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3:28
JEE MAINS 2018 A die is thrown three times. Events A and B are defined as follows:
A:4 on the th...
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1:29
IIT JEE SEQUENCES AND SERIES Three numbers form an increasing G.P. If the middle number is double...
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3:09
IIT JEE LIMITS AND DERIVATIVES Evaluate:
`("lim")_(xvecpi/2)(cosx)^(cosx)`
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3:07
IIT JEE TRIGONOMETRIC FUNCTIONS Given that `a , b , c ,`
are the side of a ` A B C`
which is ri...
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2:18
JEE MAINS 2018 Find the angle between the lines
` vec r=3 hat i+2 hat j-4 hat k+lambda( hat i+2 ...
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2:40
IIT JEE TRIGONOMETRIC FUNCTIONS If `A+B+C=(3pi)/2, t h e ncos2A+cos2B+cos2C`
is equal to
(a) `1...
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4:00
JEE MAINS 2018 An electronic assembly consists of two sub-systems say A and B. From
previous ...
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4:01
The side `A B`
of a parallelogram `A B C D`
is produced to any point `Pdot`
A line through `A`
...
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4:30
In ` A B C ,D`
is the mid-point of `A B ,P`
is any point of `B CdotC Q P D`
meets `A B`
in `Q`...
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2:40
IIT JEE SEQUENCES AND SERIES If `|a| lt 1a n d|b| lt 1,`
then the sum of the series `1+(1+a)b+(1...
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3:23
IIT JEE RELATIONS AND FUNCTIONS The range of `f(x)=sin^(-1)((x^2+1)/(x^2+2))`
is
`[0,pi/2]`
(b) ...
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2:20
IIT JEE LOGARITHM Solve
`4^((log)_9x)-6x^((log)_9 2)+2^((log)_3 27)=0`
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4:05
IIT JEE RELATIONS AND FUNCTIONS The function `f(x)=(sec^(-1)x)/(sqrt(x)-[x]),`
where `[x]`
denote...
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4:27
IIT JEE RELATIONS AND FUNCTIONS The domain of `f(x)=cos^(-1)((2-|x|)/4)+[ log(3-x)]^-1`
is
(a)`...
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4:22
IIT JEE RELATIONS AND FUNCTIONS The range of `f(x)=sin^(-1)(sqrt(x^2+x+1))i s`
`(0,pi/2)`
(b) `...
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5:52
IIT JEE LIMITS AND DERIVATIVES The population of a country increases by 2% every year. If it incr...
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1:25
JEE MAINS 2018 The Cartesian equations of a line are `x=a y+b ,z=c y+ddot`
Find its direction ra...
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1:13
JEE MAINS 2018 Find the vector of a line passing through `(2,-1,1)`
and parallel to the line who...
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9:14
IIT JEE LIMITS AND DERIVATIVES `("lim")_(xvecoo)"{"(n/(n+1))^(alpha)+s in1/n]^n`(when `alpha in Q...
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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...