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For all values of x and y, sec2t = 4xy/(x+y)2 will be true if and only if a) x+y \neq 0 b) x=y , x \neq 0 c) x=y d) x \neq 0, y \neq 0 Ans b ...

Q1 torque T on a body about a given point is found top be equal to C x L where C is a constant vector and L is angular momentum of body abt that point. Choose correct statements a) L doesnt change with time b) dL/dt is perpen ...

find the of set values of a for which f(x)=( a+4 /1-a -1)x5-3x+loge5 decreases for all x ...

Why is N2O3 most acidic among all the oxides of group 15 elements??? ...

i was looking in hall and knight and ound that there were various methods to solve the same sum like the sum of 1.2.3 +3.4.5 i typicallly do these methods by the sigma method and i ifnd this cupled with some iq an metho of di ...

*Image* ...

1.find angular momentum of spool at time t about bottom of spool *Image* Ans. (r+R)t2 ...

*Image* my doubt since ∫dl=0 why net force is not 0? ...

FIND THE SUM TO N TERMS OF THE FOLLOWING SERIES 3+7+14+27+52+... ...

Find what straight lines are represented by the following eqn: x3-6x2+11x-6=0 ...

This is fun to work out. Let \tau(m) represent the number of divisors of the natural number m. Then prove that \tau(1)+\tau(1)+ ...+\tau(n) = \left[\frac{n}{1} \right] + \left[\frac{n}{2} \right]+...+\left[\frac{n}{n} \right] ...

2 regular polygons are inscribed in the same circle.first polygon has 1982 sides and second has 2973 sides.If the polygon has comon vertices,find their total no. and plz dont give me BT soln[1] ...

The following eqn represents two straight lines. 6y2-xy-x2+30y+36=0 Find their point of intersection and the angle between them. ...

y=log{ex} {.} stands for fractional part of x. ...

A 1.5 kg block is kept stationary on a horizontal surface.A force f= 4 - x2 starts acting on it on the COM in the horizontal direction.the max K.E of the block between 0<=x<=2m is(where <= denotes greater than or equ ...

f(x) = 1 +x , 0 ≤x≤2 = 3 -x , 2 < x ≤ 3 then f(f(x)) at x= 1 is [a] 1 (b] 3 i kno d method , so pls only tell wich one is d ans acc to u ? ...

Q) A particle is moving in a circle of radius R, such that at every instant the magnitudes of the instananeous accn and the radial accn are equal. If vel. of the particle be v0 at time t=0, find the time reqd for the completi ...

the speed of a particle moving in a circle of radius=2m is given by v= t2+4 .find the radial and tangential acceleration of the particle ...

we know fibonacci series.. 1 1 2 3 5 8.......... is there a way to find the nth term? ...

Five persons entered the lift cabin on the ground floor of an 8-floor house. Suppose that each of them independenly and with equal probability can leave the cabin at any floor beginning with the first. Find the probability of ...

plz give mechanism also----------- *Image* 4...can anyone explain function of Ag2O in ARDNT ESTER REACTION ...

is it aromatic? *Image* its actually not....explain why? ...

Try this. *Image* Derived the structure of A if you wanted a starting hint. Its the structure I've drawn by pen. Am uploading image by a link so that you can zoom : http://i138.photobucket.com/albums/q243/SVXX/scan032.jpg PS ...

If a, b, c are the roots of x3+2x2+3x+3 then \left( \frac{a}{a+1}\right)^3+\left( \frac{b}{b+1}\right)^3+\left( \frac{c}{c+1}\right)^3 is equal to (Another good one i got from a student) ...

find value of sin^{-1}(sin(2010))= ...

1) A:potential at a point in induced elec field is not defined R:induced electric field lines are always closed and hence work done on pt. charge by elec. field in round trip wont be zero 2) A:work done by constant force is i ...

find- \sum_{r=0}^{q}({^{q}C_{r}}).(^{N}C_{n-r}).(a^{N-n+r}) ??? ...

http://www.youtube.com/watch?v=mzKmGTVmqJs ...

1.If roots of ax^2-bx+c=0 lies between 0 and 1 P.T: log abc>2 5 ...

A10% solution of cane sugar has undergone partial inversion according to the reaction: Sucrose+ Water -------> Glucose + Fructose. If the boiling point of solution is 100.27°C. (a) What is the average mass of the dissolve ...