A. 1/1+25x2
B. 5/1+25x2
C. 1/1+5x2
D. 5/1+5x2
If x2+y2=a2 then dy/dx=
If y=(x+√x2-1)m then (x2-1)y2+xy1=
The derivative of cosec-1(ax)w.r.to x is