α + β = 90°
AE = 1/cosα = √6 cosα
→ cos²α = 1/√6
CD = DE·cosβ
= (√6 cosβ)·cosβ
= √6 cos²β
= √6 sin²α
= √6 (1 - cos²α)
= √6 - √6 cos²α
= √6 - √6 · (1/√6)
= √6 - 1
α + β = 90°
AE = 1/cosα = √6 cosα
→ cos²α = 1/√6
CD = DE·cosβ
= (√6 cosβ)·cosβ
= √6 cos²β
= √6 sin²α
= √6 (1 - cos²α)
= √6 - √6 cos²α
= √6 - √6 · (1/√6)
= √6 - 1
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