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but this is a problem from irodov
they gave an exact answer a wave equation in terms of K`, w`
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Integrating factor of dy/dx + (1/x)tany= (1/x2)tanysiny is________
please work it out for me
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If the value of (x2+x-1)/(x2+x+1) is in the form 2cos2 where 0<=<= then
lies in the interval

a)[pi/4, 3pi/4]
b)[pi/3, 2pi/3]
c)[pi/6, 5pi/6]
d)[0,pi/2]

kindly explain soon
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ur absolutely right iithopeful absolutely
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(CMe3)CBr + H2O gives (CMe3)COH +HBr
This reaction is an example of nucleophilic substitution but not free radical substitution but why

also

Is  K2CO3 not a source of CO2 in submarines
soon pleas
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IS decrease in entropy as gas condenses into liq more or liquid solidifies into soild more
pleasde explain
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If the radius of octahedral void is  r and radius of the atoms in close packing is R derive the relation between r and R
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KF has NaCl structure. What is the distance between K+ anf F- in KF is the density is 2.48g/cc?
fast
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A longitudinal standing wave y=acoskxcoswt is maintained in a homogeneous medium of density d Find theexpression for space density of
a)potential energy Ep (x,t)
b)kinetic energy Ek (x,t)
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Demonstrate that any differentiable function f(t+ax), where a is a constant provides a solution of wave equation. what is the physical meaning of thwe constant a

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A plane elastic wave y=acos(wt-kx) propagates in a medium K find the equation of this wave in a reference frame K' moving in the positive direction of the x axis with a constant velocity V relative to the medium K
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understood
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If a,b,c are +ve integers and if roots of eqn ax2-bx+c=0 lie in (0,1) and min value of a is K1, min value of b is k2 min value of c is k3 then k1+k2+k3=...........
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p+ Cospx Siny = SinpxCosy p=dy/dx then what is/are the soln of this diff. equation
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n2 + 19n + 92 is a perfect square n is an integer
then
a)no. of values of n is 2
b)no. of values of n is 4
c)sum of values of n is 63
d)product. of values of n is 88
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If A is a square matrix of order n suchthat /adj(adjA)/ = /A/9
then the value of n can be
a)4
b)2
c)4 or 2
d)none
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If a circle having centre at (a,b) and radius r completely lies within two lines x+y=2 and x+y=-2 then min(/a+b+2/, /a+b-2/) is
a)greater than r(root2)
a)less than r(root2)
a)greater than 2r
a)less than r
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If   be the area of triangle ABC and suppose  a small error occurs in the measurement of c then    is given by
a)  /4[1/s + 1/s-a + 1/s-b - 1/s-c]c
b)  /2[1/s + 1/s-a + 1/s-b - 1/s-c]c
c)  /3[1/s + 1/s-a + 1/s-b - 1/s-c]c
d)  none
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