Udowodnij, że jeśli \alpha jest kątem ostrym, to równośc
cosa / (1 +sina) = (1 - sina) / cosa
(1 - sina)(1 + sina) = cosa * cosa
1 - sin^2a = cos^2a
cos^2a = cos^2a
L = P
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cosa / (1 +sina) = (1 - sina) / cosa
(1 - sina)(1 + sina) = cosa * cosa
1 - sin^2a = cos^2a
cos^2a = cos^2a
L = P