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cos²α=sinα
1-sin²α=sinα
s²+s-1=0 Δ=5
s1=(-1-√5)/2 ∨ s2=(-1+√5)/2
-------------------------------
sprawdzam s(1+s) ?=1
dla s1
s+s²=(-1-√5)/2 +(1+2√5+5)/4=-1/2-√5/2+1/4+√5/2+5/4=3/2-1/2=1
dla s2
s+s²=(-1+√5)/2 +(1-2√5+5)/4=-1/2+√5/2+1/4-√5/2+5/4=3/2-1/2=1
cbdu
----------------- 2-gi sposob --------------
cosα=tgα
cos²α=sinα
sinα(1+sinα)=sinα+sin²α podstawiam za sinα=cos²α
cos²α+sin²α=1
cbdu
Pozdr
J