A. 3a
B. 2a
C. a
D. 4a
The two curves y=x-3, y=e3(1-x) at (1, 1)
The distance between the origin and the normal to the curve y=e2x+x2 at x=0 is
The angle between the curves x2=4y, x2+y2=5 at (-2, 1) is
The equation of the tangent to the curve x2+2y=8 and which is perpendicular to x-2y+1=0 is
The condition for f(x)= x3+px2+qx+r(x R) to have no extreme value, is
When a circular oil drop expands on water, its area increases at the uniform rate of 40sq. cm per minute. The rate of increase in the radius when the radius 5 cm is
The two curves x2+y2=25, 2x2-9y+18=0
The minimum value of x3-9x2+24x-12 is
The maximum value of x2-x+1/ x2+x+1 is
If y=x3-ax2+12x+5 is increasing for all real values of x, then a lies between