ellipse ∠ = 90° || = 2a±√2b，√2b || = 2a±√2b，√2b ( -√b2-a2±2√b2-a2-(1-b2 /a2 )/(1-b2 /a2 )，± b√(1-｛-√b2-a2±2√b2-a2-(1-b2 /a2 )/(1-b2 /a2 )} 2 / a2 ) ∠ APB = 90° |AP| = √( a+√2a2-b2 / 3 - b2 /a2 ) 2+ b2 {1-(√2a2-b2 / 3 - b2 /a2 )2 / a2 }…

ellipse a ≠ b circle || + || ≠ 2a T.theodor 2022.7.26

equation f(x) = ax2 - c ax2 - c = 0 x = ± √c/a x = - b/2a ± √c/a T.theodor 2022.7.26

object ヲ斜投シタ時、 y = mv1tcosθ - 1/2gt2 + mv2tcosθ - 1/2gt2 mvsinθ < g y = mv1tsinθ - 1/2gt2 + mv2tsinθ - 1/2gt2 T.theodor 2022.7.26