A. 0
B. 1
C. -1
D. 2
If x= 2 cos t- cos 2t, y= 2 sin t- sin 2t then dy/dx=
d/dx{Tan-1√(1-cos x)/(1+cos x)}=
If ay= sin(x+y) then y2+(1+y1)3 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