l
Vertical line of sum
l
Intersect with H, take the reverse extension line Ox of OH as the polar axis, and establish the polar coordinate system.
Aim the focus f.
l
Distance │HO│=p,
P(ρ, θ) is an arbitrary point on the conic section, which is connected with OP and denoted as PD ⊥ L.
, PQ⊥Ox, then OP=ρ, ∠xOP=θ.
According to the definition of conic, there are
│OP│/│PD│=e, and │PD│=│HQ│=│HO│+│OQ│=p+ρ? cosθ
therefore
ρ/(p+ρ? Cosθ) = E. That is
ρ=ep/( 1-e? Cosθ). Here it is.
Stdio.h means "standard input &; "Output" refers to the standard input and output header files! So when you use standard input and output functions, you should call this header file!