A. (1/2)tan x/2+tan x2/22+...+nxn-1/xn tan xn/2n
B. (1/2)tan x/2+(x/2)tan x2/22+...+nxn-1/2n tan xn/2n
C. (1/2)cot x/2+(x/2)cot x2/22+...+nxn-1/2n cot xn/2n
D. (1/2)cot x/2+(x/2)cot x/2+...+nxn-1/2n cot xn/2n
If y=acos2x+b sin2x, then y2+4y=
d/dx{cos[2 sin-1(cos x)]}=
If y=(ax+b/cx+d) then 2y1y3=
d/dx{Sin-12x/1+x2+Sec-11+x2/1-x2}=
The derivative of (ax+b)cx+d w.r.to x is
If x=e2tcos 3t, then d2x/dt2 at t=π/2 is
If xy=c2 then dy/dx=
If y= log sin x then y2=
If f(x)= x(√x-√(x+1)) then
If y2=a2cos2x+b2sin2x then y+y2=