A. 0
B. 1
C. -1
D. cos(x+y)
If y= a cos mx+b sin m=mx, then d2y/dx2=
If y=2 Tan-1(x√2/1-x2)+log(1+x√2+x2/1-x√2+x2), then dy/dx=
If (x+y)2=ax2 +by2 then dy/dx=
If y√1+x2=log(x+√1+x2) then (1+x2)y1+xy=
If y=x+1/(x+1/x+....∞) then dy/dx=
If x= sin t cos 2t, y= cos t sin 2t then (dy/dx)t=π/4
If x2+5xy+y2-2x+y-6=0 then y’’ at (-1,1) is
A function f:R→R satisfies the equation f(x+y)=f(x)f(y),x,y ε R and f(x)≠0 for any x εR. If f is differentiable at x=o and f'(0)=2 then for any x εR, f1(x)=
d/dx{x2+3x+6/(x+3)(x-5)}=
If x= acos3θ, y= asin3θ then d2y/dx2 at θ=π/4 is