The area contained between the curve xy = a2 , the vertical line x = a, x = 4a (a > 0) and x -axis is
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If | x | < 1, then the coefficient of xn in the expansion (1 + x + x2 + x3 + ....)2 is
The pair of lines represented by 3ax2 + 5xy + (a2 - 2)y2 = 0 are ⊥ to each other for
From the origin chords are drawn to the circle x2 + y2 - 2y = 0. The locus of the middle points of these chords is
The value of f(0) so that f x = sinx / x is continuous at x = 0 is
The tangent drawn from (α,β) to an ellipse (x2/a2)+(y2/b2)=1 touches the circle x2+y2=c2 then the locus of (α,β) is
The general solution of the differential equation (x+a)p2+(x-y)p-y=0 is :
The minimum value of a tan2 x + b cot2x equals the maximum value of a sin2 θ + b cos2 θ where a > b > 0, when
If grad of one line of equation x2+kxy+2y2=0 is double of other, h =
In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?
A purse contains 4 copper coins and 3 silver coins, the second purse contains 6 copper coins and 2 silver coins. A coin is taken out from any purse. The probability that it is a copper coin is
If the roots of the equation a/x - a + b/x - b = 1 are equal in magnitude and opposite in sign, then
The fourth, seventh and tenth terms of a G.P. are p, q and r respectively, then
Suppose that g (x) = 1 + √x and f (g(x)) = 3 + 2 √x + x, then f (x) is
The coordinates of foot of perpendicular from (2,3) to the line x+y+1=0 are
The equation of the tangent at the point P(t), where t is any parameter, to the parabola y2=4ax is