x=5(3-z)cosθ/3,y=(3-z)sinθ,
cosθ=3x/[5(3-z)],sinθ=y/(3-z),
(3x)²/[5(3-z)]²+y²/(3-z)²=1,
9x²/25+y²=(3-z)²,
x²/25+y²/9=(3-z)²/9.
cosθ=3x/[5(3-z)],sinθ=y/(3-z),
(3x)²/[5(3-z)]²+y²/(3-z)²=1,
9x²/25+y²=(3-z)²,
x²/25+y²/9=(3-z)²/9.
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