-& gt; The angle formed by non-planar straight line PA and BE =∠OEB.
△ in△ PBC: COSC = (BC/2)/PC = √ 2/4.
△ In△ △EBC: Really? =BC? +CE? -2BC * BEcosC = 2+ 1- 1 = 2
△OBE: 0b = 1, OE = PA/2 = 1, BE = √ 2-> △OBE isosceles right triangle.
-& gt; The angle formed by non-planar straight line PA and BE = ∠ OEB = 45.
2.0-0.5x Root Number 2
3. The intersection can be A(c, 3c/2) and substituted into hyperbolic equation, and C 2-A 2 can be used instead of B 2 to solve the equation about E 2.