Doubtnut
581 old videos with fewer than 5,000 views from this channel.
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JEE MAINS 2018 How many times digit 5 appears in writing natural numbers from 1 to 100
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If `y=[x+sqrt(x^2+a^2)]^n` then prove that `(dy)/dx=(ny)/sqrt(x^2+a^2)`
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27657 + 27657
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A school bus driver starts from the school drives 2 km towards North, takes a left turn and dr...
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6:21
`lim_[x- gtpi/4][sqrt2cosx-1]/[cotx-1]`
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Evaluate `int dx/(sin^2x-5 sinx cosx)`
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If the ratio of the roots of the equation `lx^2+nx+n=0` is `p:q` prove that `sqrt(p/q) +sqrt(q/...
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4:07
If the circle `|z-1| = 3 and | z-z_0| = 4` intersect orthogonally, then
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The condition for `ax^2 +2cxy+by^2 +2bx+2ay+c` is resolvable into two linear factors is
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3:57
Express the given expression in the standard form 0.0001289 -0.0000000274 x 1293+0.0000419032
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Prove by using PMI `1^3+2^3+3^3+...+n^3-=((n(n+1))/2)^2`
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if the straight line `xcosalpha+y sin alpha=p` touches the curve `x^my^n=a^(m+n)` prove that `p...
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Let A= `[a_(ij)]_(nxxn)` where `a_(ij) = i^2-j^2.` Then A is:
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If `0^@ lt theta , phi lt90^@` and `tantheta = 1/7, sinphi = 1/sqrt(10)` then:
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ABCD is a parallelogram and O is the point of intersection of its diagonals. If `ar(triangle AO...
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`A=[[0, 1, 2],[1, 2, 3],[3, 1, 1]]`, to find `A^-1, A^-1=adjA`
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The function `f(theta) = d/(d theta)int_0^(theta)(d theta)/((1-cos2theta)(1+cos2theta))` satisf...
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`x/(x+1) +(x+1)/x=34/15`, `(x!=0, -1)`
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Let A and B be too sets containing four and two elements respectively then the number of subset...
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Let M be the set of men and R is a relation 'is son of` defined on M. Then, R is (a) an equiva...
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One of the diagonals of a parallelopiped is `4vec j-8vec k`, If the 2 diagonals of its face are...
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Let `v=2 vec i+vec j-vec k`, `w=vec i+ 3 vec k and vec u` is a unit vector then the maximum val...
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The area enclosed between the curves `y = ax^2 and x = a y^2` is 1 sq. unit, value of a is
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Using matrices, solve the following system of equations : `x+2y+z=7 , x+3z=11 , 2x-3y=1`