A. tan θ
B. cot θ
C. cot θ/2
D. tan θ/2
If sec θ-cos θ, y= secn θ- cosn θ then (dy/dx)2=
d/dx{Tan-1 1/√x2-1}=
If x= a(θ+sin θ), y=a(1-cosθ) then d2y/dx2 at θ=π/4 is
d/dx{Tan-1x/√1-x2+Sec-11/√1-x2}=
d/dx{Tan-1√(x2/a2-x2)}=