xcos Ω/a+ysin Ω/b=1,xsin Ω/a-ycos Ω/b=1 구 증:x^2/a^2+y^2/b^2=1 좌등 소인

xcos Ω/a+ysin Ω/b=1,xsin Ω/a-ycos Ω/b=1 구 증:x^2/a^2+y^2/b^2=1 좌등 소인

(xcos Ω/a+ysin Ω/b=1,(xcos Ω/a+ysin Ω/b)^2=1,즉(xcos Ω/a)^2+2*xcos Ω/a*ysin Ω/a*ysin Ω/b+(ysin Ω/b)^2=1,xsin Ω/a-ycos Ω/b=1(xcos Ω/a-ysin Ω/a-ysin Ω/b)^2=1,즉(xcos Ω/a)^2-2*xcos Ω/a/a-ycos Ω/a-ycos Ω/b=1(xcos Ω/a-ysin Ω/b)^2=1,즉(xcos Ω/a)^2-2*2*두 식 을 더 하면 x^...